1912.] 



NATURAL SCIENCES OF PHILADELPHIA. 



197 



produced and divided by a very minute subobsolete longitudinal 

 sulcus. Maxillary palpi with penulti- 

 mate joint about two-thirds as long as 

 terminal joint, the latter expanding 

 gently distad, gently obliquely truncate. 

 All of the palpal joints proportionately 

 more attenuate than in the two known 

 species of the genus Cycloptilum. Eyes 

 pyriform, subvertical. Pronotum 

 narrowing regularly cephalad, consider- 

 ably produced caudad, the entire dorsal 

 surface transversely gently arcuate; the 

 caudal margin transverse, broadly arcu- 

 ate. Tegmina wholly concealed from 

 above by the pronotum, from the side 

 the lateral field may be seen to embrace 

 the abdomen. Cerci as long as the 

 abdomen. Cephalic tibiae with cephalic 

 face bearing a large, oval and distinct 

 tympanum. Caudal femora dilated. 

 Caudal tibia? with three pair of well-devel- 

 oped distal spurs, the dorso-internal no- 

 ticeably shorter than the ventro-internal 

 spur, the medio-internal spur considerably 

 longer than the others with its length contained about twice in the 

 metatarsus. Caudal metatarsus rather long, straight, rather broad, 

 sulcate dorsad, both dorsal margins armed with four and five on 



inner and six and seven well-developed 

 serrations 27 on outer margins, the distal 

 extremity armed on both sides with 

 a long spur, the longer inner spur 

 reaching to the end of the first third 

 of the terminal tarsal joint. 



A female, taken with the male here 

 described, differs from it in the 

 following respects : 



Larger; the pronotum subquadrate, 

 narrowing very little cephalad; tegmina absent. The subgenital 



Fig. 5. — Cryploptilum antil- 

 larum. Dorsal view of 

 male specimen here de- 

 scribed. (X 4.) 



Fig. 6. — Cryploptilum antilla- 

 rum. Internal face of caudal 

 metatarsus and tibial spurs. 

 (Greatly magnified.) 



27 The number of these serrations is found to vary considerably in the species 

 of this group, but the inner margins always bear fewer serrations than the outer 

 margins in the same individual. 



