OF PHILADELPHIA. 6 



Genus NEMOGNATHA Illiger, Zonitis of Fabr. and Latr. 



Maxillae very much elongated, inflected, filiform. 



N. IMMACULATA. — Lemon yellow, immaculate. Elytra with 

 scattered punctures. Maxilla not longer than the thorax, and with 

 the antennae and palpi black. 



N. IMMACULATA, American Entomology, plate III. [Plate 

 VII.; ante, 1, 13.] 



Inhabits the plains of the Missouri. 



Antennae black, basal joint pale testaceous. Eyes, maxillae, pal- 

 pi, tips of the thighs and tarsi black. Elytra irregularly punc- 

 tured, naked, polished. 



Comes near to the description of Zonitu pallida of Fabricius, but 

 that insect is said to be large, and may probably be a true Zouitis. 

 Our specimens are not more than half the size of N. vittata. 



Found on thistles (Cardui) by Mr. Nuttall: numerous. 



Genus ZONITIS Fabricius and Latreille. 



Maxillae not elongated. Antennae with the first and the third 

 joint of the same length, the second a little shorter, the third and 

 following cylindric, the last one fusiform, terminating abruptly in 

 a short point. 



Z. BILINEATA. — Fcrruginous. Elytra pale yellowish, with a 

 black fillet. Scutel black. 



Inhabits with the preceding on thistles. Nuttall. [23] 



Antenna) black, the two basal joints ferruginous. Eyes black. 

 Elytra naked, punctured, the fillet occupies the middle of each 

 elytron and is abbreviated at the base and apex. Scutel black. 

 Tibia fuscous. Less than the preceding insect. In its color and 

 appearance, except as to size, it resembles N. vittata. 



Order BIPTERA. 

 Genus DIOPSIS Linn. 

 Head furnished with two inarticulate, immoveable horns. Eyes 

 situated at the extremit es of the horns. Antennae small, placed 

 beneath the eyes. 



D. BREVicoRNis — Black, pedicels short, not so long as the in- 

 terval between the bases. [Ante vol. 1, p. 116.] 



Inhabits Pennsylvania. 



Head rufous ; vertex brown, thorax blackish, a little blended 

 1817.] 



