Title: Bulletin
Identifier: bulletin7073sout (find matches)
Year: 1971- (1970s)
Authors: Southern California Academy of Sciences
Subjects: Science; Natural history; Natural history
Publisher: Los Angeles, Calif. : The Academy
Contributing Library: New York Botanical Garden, LuEsther T. Mertz Library
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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RESEARCH NOTES A NEW SPECIES OF COMATACARUS (ACARINA: TROMBICULIDAE) FROM CENTRAL UNITED STATES Studies of North American chiggers of the subfamily Leeuwenhoekiinae have revealed a new species of Comatacarus Ewing. a genus recently revived hy Reed (1973). Examples of this species were reported previously as Leetiwenhoekia (Comatacarus) ameri- cana (Ewing) in studies of the larvae (Loomis, 1956, and Finley. 1958) and nymphal stage (Crossley, 1960). The type series is in the University of Kansas chigger collection currently housed at California State University. Long Beach. However, the holotype will be sent, on loan, to the Rocky Mountain Laboratory (RML and USNM). Studies upon which this paper is based were supported by the U.S. Public Health Service Research Grant AI 03407 from the National Institute of Allergy and Infectious Diseases. Comatacarus pusillus, new species Figure 1 Types.—Holotype (KU 6171. in RML) plus 4 para- types (KU 6172-6175) from 24 km N, 19 km W St. Francis. Cheyenne Co, Kansas, from Peromyscus maniculatus (RL 521101-14) taken 1.XI.1952 by R. B. Loomis; 4 paratypes (KU 6167-6170) same data as holotype except host Reithroclontomys mega- bits (RL 521101-15). Diagnosis.—Palpal setal formula B/B/BBB + 7B; chela with tricuspid cap; galeala branched; 2 genualae I, genuala II and III; tibiala III; subterminala and parasubterminala I; femur I with incomplete suture: sensilla nude; PW/SD = 1.4. Description of holotype (all measurements in mi- crons with means and extremes of the nine types in parentheses).—Larva: red in life measuring 400 X 270, partially engorged. Idiosoma: Dorsal body setae arranged 2-44-12- 14-14-14-8-6-4 total 118: measurements: numerals 57; anterior dorsal 66-39. Ventral setae 94; measure- ments; 2 sternal setae 42, 48; preanal setae 27-30, 44; postanal setae 36-42; total body setae 220. Gnathosoma: palpal setal formula B B BBB + 7B; chela 44, with a tricuspid cap; trifurcate palpal claw; galeala branched. Scutum: With few and scattered puncta anterior margin biconcave, posterior margin smoothly rounded; AM seta with short accessory branch on basal third; AL bases anterior to AM bases; SB slightly anterior to PL bases; PW/SD = 1.4; sensilla nude. Scutal measurements: AW 72 (73, 72-75); PW 87 (87. 81-89): SB 30 (27, 21-30); ASB 39 (35, 30- 39): PSB 27 (27, 27-30); AP 39 (38, 36-40); AM 48 (47, 45-50): AL 51 (53. 48-60): PL 45 (48, 45-55): S 84 (84, 78-87); nase 16 X 10. Legs: 6-6-6 segments, terminating in pair of claws and clawlike empodium, without onychotriches. Leg I: 360 (350-400); coxa with 2B (branched setae); trochanter with IB; femur with IB proximal, incomplete suture; and 5B distal: genu with 4B, 2 genualae, microgenuala: tibia with 8B, 2 tibialae, microtibiala; tarsus 117 X 30 with 40B, tarsala 18 (18-21). microtarsala, parasubterminala, subtermi- nala, pretarsala. Leg II: 312 (312-355): coxa with IB; trochanter with IB; femur with 6B; genu with 4B, genuala, microgenuala; tibia with 6B, 2 tibialae; tarsus 93 X 30 with 25B, tarsala 21 (21-24), microtarsala, pretarsala.
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Figure 1. Larva of Comatacarus pusillus, new species, A, scutum and eyes; B. dorsal aspect of gnathosoma: C. ventral aspect of palpal tibia and tarsus; D, selected setae (H, humeral; AD, anterior dorsal: PD, posterior dorsal; S, sternal; V, ventral); E, leg I distal three segments showing nude setae with measurements in microns and bases of branched setae; F, leg II as above; G, leg III as above. 770

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