162 ACADEMY OF NATURAL SCIENCES 



DORTHESIA Latr. 



1. D. FASCIATA. — 'Black ; elytra yellowish, ovate, black at 

 base; wings witli a blackish band. 



Inhabits Missouri. 



Body deep black, opaque, punctured : vertex elevated into a 

 carinated tubercle : antcnna3 dilated, brown, paler at base of the 

 processes, concave before ; scapus very short, dusky ; flabellate 

 processes elongated, robust : front plane : palpi obsoletely annu- 

 late with pale : thorax slightly emarginate over the scutel, an 

 impressed, abbreviated, dorsal line : elytra reddish-j'^ellow, sub- 

 ovate ; exterior margin from the base to the middle, and basal 

 margin, black ; wings white, an irregular fuscous band near the 

 tip : feet black ; anterior pair pale rufous, thighs black behind ; 

 intermediate pair, tibiae and tarsi pale rufous ; posterior tarsi pale 

 rufous. 



Length three-tenths of an inch nearly. 



\^Dorthesia is a genus of Diptera ; the two species here de- 

 scribed belong to Myodes. — Leg.] 



2. D. FLAVICORNIS. — Black ; antennse bright yellow ; elytra 

 dark piceous, with a common pale spot. 



Inhabits Pennsylvania. 



Mouth with whitish hairs ; mandibles pale piceous : thorax 

 minutely granulated, with a polished oblique slightly elevated 

 spot each side of the middle : elytra rounded at tip : a common 

 dull [275] yellowish cinereous spot an tip : wings hyaline : feet 

 dull honey-yellow, posterior pair darker. 



Length less than one-fifth of an inch. 



Resembles the preceding, but is smaller, destitute of the band 

 of the wings, and of the impressed thoracic line. 



RIIIPIPIIORUS Bosc. Latr. 



R. BICOLOR. — Black ; thorax dull rufous ; elytra pale testa- 

 ceous ; head truncate above. 



Inhabits ]'ennsylvania. 



R. bicolor Melsh. Catal. 



Head punctured : vertex much elevated, truncated above, the 



superior angles rounded : antennas : palpi piceous : thorax 



dull rufous, punctured ; posterior edge black : elytra pale testa- 



[Voi. in. 



