NYCTERIBIA. 291 



slender, and horny style. Antennae biarticulate, inserted in the supe- 

 rior margin of the front of the head, very short, contiguous, porrect, 

 parallel ; second joint larger than the first, subtriangular, rounded ex- 

 ternally. Thorax short-oval above, divided into compartments by nar- 

 row crustaceous ridges ; underside quite flat, of a uniform crustaceous 

 texture, with a central longitudinal line running from the anterior to 

 the posterior extremity ; a pectinated process on each side of the thorax, 

 placed between the base of the fore and middle legs, and received in a 

 cavity formed by the lateral productions of the dorsum and pectus. 

 Legs thick, very long, furnished with strong bristles, inserted at the 

 anterior and lateral margins of the thorax, the pectoral shield extending 

 beneath at the base of each ; fore coxae distinct, bristly, rather long ; 

 trochanters very short; femora thick, compressed, with a transverse 

 impression before the middle of the limb ; tibiae more slender but not 

 longer than the femora, with three slight traces of articulation towards 

 the base; basal joint of the tarsi very long, apparently annulated; 

 three following joints very short ; fifth much larger, furnished with a 

 pair of large onychia, and with two strong claws, which are dilated at 

 the base beneath. Male. Abdomen composed of five or six segments. 

 Fern. Abdomen with only two apparent segments. 



Infest bats. 

 a. Abdomen of the female with two long styles. Subgenus Stylidia, 



Westw. Species 1. 

 a a. Abdomen of the female without styles. Species 2. 



1. biarticulata, Herm. Mem. Apt. pi. 6. f. 1 (1804); Lea. Zool. 

 Misc.; Westw. Hermanni, Lea. Enc. Brit. vesper filionis, Mont. 

 Pallide ochracea, thorace subtus concolore, abdomine obscuriore, pedi- 

 bus elongatis, dilatatis, longi-setosis, seta uriica ad basin tibiarum lon- 

 gissima, coxis anticis brevibus; Mas, abdomine 6 ?-articulato, subtus 

 ad apicem stylis duobus incurvis ad ventrem adpressis; Fcem. abdo- 

 mine quasi biarticulato, segmento primo supra longius producto, stylis 

 duobus caudalibus elongatis cylindricis porrectis ad apicem longi-setosis. 

 Long. li-2 lin. 



Pale ochraceous. Abdomen darker. Legs long, dilated, with long 

 bristles ; a single very long bristle at the base of the tibiae ; fore coxae 

 short. Male. Abdomen apparently six-jointed, having at the tip be- 

 neath two styles, which are curved and applied to the underside. Fern. 

 Abdomen apparently six-jointed, with the first segment most lengthened 

 above, and with two anal long cylindrical porrect styles, which are beset 

 with long bristles at the tips. 



Bare. In the British Museum. (E.) 



2. Vespertilionis, L. Fn. 1941 (1761); P.; Gmel.; Schr. ; 

 Latr. ; Meig. ; Mcq. ; Zett.Latreillii, Lea. ; Curt. ! B. E. vi. pi. 277 ; 

 Westw. Pallide ochracea, thoracis pectore latiore et breviore, pectinibus 

 thoracis unguibusque nigris, pedibus perbrevibus, femoribus tibiisque 



