ART. 29 NEW TROMBICUL.\ FROM PANAMA EWING 3 



DESCRIPTIONS OF NEW SPECIES 



The first two descriptions given here are based on adults, the third 

 upon larvae. The adults have been cleared in potassium hydroxide, 

 and in the case of one species have been stained in addition. This 

 staining has brought out the male genital armature, which is de- 

 scribed probably for the first time for any species. It will be inter- 

 esting to note whether this character will be of value in the differen- 

 tiation of closely related species. 



TROMBICULA TRIFURCA, new species 



Figure 1 



Adult. — Slender, with anterior pair of legs, mouth parts, and an- 

 terior part of cephalothorax darker and more sclerotized than the 

 other parts. Mouth parts situated on a more or less distinct capitu- 

 lum, which has parallel sides and is terminated below in a large, 

 trowel-shaped hj-postome. Palpi slender, extending to about the 

 middle of first patellae ; palpal claw weak, slightly curved, about two 

 thirds as long as segment which bears it; palpal thumb very slightly 

 swollen, reaching base of palpal claw ; only one accessory spine pres- 

 ent, which is about one half as broad as palpal claw. Chelicerae very 

 long and slender, basal segment about four fifths as long as capitu- 

 lum ; chela slender, with a sharp upper edge. Crista broad, platelike, 

 with pseudostigmatic area reduced and near the posterior end; 

 pseudostigmata small, circular, and far apart; pseudostigmatic or- 

 gans apparently absent. Ej^es absent. Abdomen fully twice as long as 

 broad and with the usual constriction at the level of third and fourth 

 coxae; setae longest around posterior margin. Genital opening 

 large, situated about half its diameter from fourth pair of coxae; 

 genital suckers six, first pair slightly larger than the others. Anal 

 opening about half as broad and two thirds as long as genital open- 

 ing, and situated about its greatest diameter from the latter. Coxae 

 of first two pairs of legs united to a sternum and those of first pair 

 each expanded along its anterior margin into a shelf-like lamella. 

 Anterior pair of legs much larger and longer than the others and 

 each ending in a pair of trifurcate claws. Legs II and III rather 

 weak, subequal; legs IV considerably stouter and longer; claws of 

 legs II, III. and IV simple, but inflated toward the tips. Length, 

 2.7 mm; width, 0.9 mm. 



Type locality. — Chilibrillo Caves, Panama. 



Type sZ2Wes.— U.S.N.M. no. 1063. 



Remarks. — Described from four mounted and cleared adults, in 

 nature found crawling on the walls of Chilibrillo Caves, Panama^ 

 by L. H. Dunn. Evidently this species does not belong to Tromhl- 

 eula, but, for reasons stated at the beginning of this paper, it is for 

 the present placed there. Its larvae probably parasitize bats. 



