1864.] 301 



well-defined transverse carina at base, afld another one a little behind 

 the middle, slightly arcuated and subobsolete in the middle and more 

 prominent and acute on each side where the tubercles are usually 

 placed; tegulas black. Wings hyaline, faintly tinged with fuscous; 

 nervures and stigma black ; areolet large, subquadrate. Legs rufous, 

 their coxae and trochanters, except the apical half of the posterior pair, 

 black ; posterior femora at tip and their tibiae dusky, their tarsi white, 

 the extreme base and apex black. Abdomen oblong-subovate, not much 

 longer than the head and thorax, rufous, polished; apical two-thirds of 

 the oth, and the whole of the followiug segments, black ; on the apical 

 third of the 3rd and 4th segments a transverse, rather indistinct, black- 

 ish line ; basal segment protuberant at tip, with a well-developed tuber- 

 cle on each side of the apical third; 2nd segment broad and flattened, 

 the basal foveae shallow. Length 3i lines; expanse of wings 6 hues. 



^f^^,._Delaware. Dr. Thos B. Wilson. 



Easily distinguished by its robust form, short abdomen, dense sculp- 

 ture and white posterior tarsi. 



16. Cryptus pumilus, n. sp. 



Black ; smooth, base of antennEe, legs, and abdomen, except 1st segment, ru- 

 fous; wings subhyaline ; basal segment of abdomen black, striated. 



Female. — Black, shining ; mandibles and palpi testaceous ; antenna; 

 more than half the length of the body, rather stout, blackish, the basal 

 third pale rufous. Thorax smooth and polished ; scutellum flattened, 

 smooth and polished, with a transverse, striated excavation in front; 

 metathorax with the elevated lines sharply defined, the central area 

 large, reniform and striated obliquely, the posterior declivity rather 

 abrupt and also striated, the lateral tubercles prominent ; tegulae yel- 

 lowish. Wings hyaline, the anterior pair slightly tinged with fuscous, 

 iridescent ; nervures and stigma pale at base, the latter rather large ; 

 areolet small, 5-angular. Legs, with their coxae, entirely pale rufous, 

 the posterior tibiae at tips, dusky. Abdomen ovate, long and slender 

 at base, somewhat flattened, polished, rufous; basal segment black, long, 

 slender, gradually dilated towards the tip, which is longitudinally stri- 

 ated above, and with two longitudinal carinae extending nearly the 

 whole length of the segment, the lateral tubercles not visible, the ex- 

 treme lateral margins at tip, yellow ; the following segments together 



