. Bulletin. Science; Natural history; Natural history. 1971 NEWSPECIESOF IN 1 KANASAl ( i<. Figure I. Microtrombicula (Crypticula) welbourni, new species. A. Scutum and eyes. B. Dorsal aspect of gna- thosoma. C. Ventral aspect of palpotibia and tarsus. D. Leg I, genu, tibia, and tarsus, showing nude setae (mea- surements in microns) and bases of branched setae. E. Leg II, as above. F. Leg III, as above. G. Body setae: 1 ST, first sternal, H. humeral, PD. posterior dorsal. H. Coxa III. distal branches and several short proximal barbs. Scutal measurements: AW 36 (34. 32-36), PW 50 (48.
. Bulletin. Science; Natural history; Natural history. 1971 NEWSPECIESOF IN 1 KANASAl ( i<. Figure I. Microtrombicula (Crypticula) welbourni, new species. A. Scutum and eyes. B. Dorsal aspect of gna- thosoma. C. Ventral aspect of palpotibia and tarsus. D. Leg I, genu, tibia, and tarsus, showing nude setae (mea- surements in microns) and bases of branched setae. E. Leg II, as above. F. Leg III, as above. G. Body setae: 1 ST, first sternal, H. humeral, PD. posterior dorsal. H. Coxa III. distal branches and several short proximal barbs. Scutal measurements: AW 36 (34. 32-36), PW 50 (, 47-50). SB 21 (20. 19-22). ASB21 (). PSB 25 (26, 25-28), AP 28 (31, 28-33). AM 28 (29, 25-33), AL 24 (21, 19-24; 1 1). PL 29 (30. 28- 32), S 60 (57, 53-60; 8). Gnathosoma: Cheliceral blade with small tri- cuspid cap and dorsal 1 nob • hcli capitulai stci num lightly pum tati (ialcala Palpal setae B/B/NbB palpotai \w vilh I nude and 5 blanched setae, and tarsals 9 palpotibii bifurcate, axial prong ilightl unisetose, 2 genualae and microgenuala ! tibialac and microtibiala, tarsala ! I I ! I 6) distal microtarsala, subterminala, parasubtcrminali pretarsala; leg II. coxa unisetose, 2 tibialac tarsala 19(19, 17-20) and proximal nil- imi.,i ,,|., |, g ||| coxa with 3 and 4 (3 to 5) setae, gcnuala tibiala, and I nude niaslitarsala I 19) Leg measurements: I 214 (209. 192-226), II 205 (190, 174-205). Ill 236 (225. 211-239), total '.; (625, 577-655). Remarks. — The cheliceral blade has a prominent knob characteristic of the lour Korean species described by Ah (1964), but not conspicuous among the American Crypticula. The geographic proximity of M. welbourni ' diabola (type localities less than 3 miles apart), may indicate an ecological relationship similar to the two sympatric species Microtrombicula nasal is and \l wrenni Loomis, recovered from the same individuals of several cricetid rodent species in Joshua I rcc National Monument. California (Loomis. I9( This
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