NATURAL SCIENCES OP PHILADELPHIA. 207 



ceous triangular appendage projecting over the 6th segment. The disc of the 

 thorax is not impressed. The reference by Kirby of Haltica 4-maculata 

 Oliv., Ent. vi. 673, pi. 1, f. 6, to this species, is more than doubtful. 



2. P. discoidea Dej., Cat. 405. GaUeruca disc. Fabr., Syst. EL, ii. 485. 

 Gall, circumdata Say, Journ. Acad. Nat. Sci. Phila., iii. 457 ; ed. Lee. ii. 221. 

 Var. G. limbata, Fabr., Syst., El. ii. 486. 



Throughout the Atlantic States and Canada. Both Fabricius and Say 

 describe the antennas as black ; the basal joints are quite frequently yellow, 

 and I have specimens in which the antennae are yellow and slightly fuscous 

 towards the tip. The color also varies, the head and thorax in one specimen 

 being black, and the under surface dark testaceous varied with piceous, the 

 thighs blackish, -the tibia and base of tarsi testaceous. The thorax has a broad 

 transverse discoidal impression, which is sometimes disposed to divide into 

 two. 



In the male, the 5th ventral segment is very large, very deeply excavated, 

 with a small elevated ridge in front of the excavation ; the 6th is deeply exca- 

 vated ; the smaller males from Canada also have the antennae quite sensibly 

 thickened externally. 



A singularly-colored specimen, collected in Kentucky, was given me by 

 Mr. J. Ph. Wild. The head is black, with the front and mouth pale yellow. 

 The thorax is bright yellow, the elytra black, with the sutural, lateral and 

 apical margin yellow, and a small humeral vitta extending one-fourth the 

 length of the elytra ; the abdomen is black both above and beneath, ventral 

 segments margined with piceous, the tip yellow ; the feet are bright yellow* 

 with the tarsi black. 



3. Ph. viridipennis. Diabrotica virid. Lee, Proc. Acad. Nat. Sci. 

 Phila., 1859, 81. 



Fort Tejon, Cal. ; Mr. Xantus. A beautiful species, having the thorax 

 strongly impressed. The 5th ventral segment of the male is excavated for its 

 almost entire surface, and is neither channelled nor carirated. 



4. Ph. luperina, nigra, thorace laevi quadrato, utrinque vage impresso, 

 elytris cyaneis, parce subtiliter punctatis, antennis testaceis extrorsum infus- 

 catis, pedibus ilavis, femoribus piceo maculatis. Long. -26. 



One specimen, collected at San Mateo, Cal., given me by Mr. A. Agassiz. 

 The discoidal impression of the thorax is vague, and scarcely extends to the 

 middle, so that it appears to be divided into two. This insect closely re- 

 sembles in appearance a Luperus. 



PHYLLECHTHRUS pej. 



Body elongate, glabrous and nearly smooth above. Head transversely im- 

 pressed between the eyes, and with a short median impressed line ; acutely 

 carinate between the antennae, which are very long ; 2d and 3d joints together 

 shorter than the 4th, nearly equal in size in the female, 2d connate with the 

 3d, and nearly obsolete in the male. Maxillary palpi stout, the last joint 

 shorter than the preceding, slender, subulate, acute at tip. Prothorax quad- 

 rate, truncate at the apex, with a lunate dorsal impression more or less dis- 

 tinct. Elytra with the lateral margin distinct, epipleurae very narrow, not 

 extending to the tip. Anterior coxae conical, contiguous ; legs slender, tibiae 

 not sulcate externally, middle tibiae of the male incised at the extremity on 

 the inner margin ; ungues with a large angular basal dilatation. Abdomen 

 with five ventral segments nearly equal in length and alike in both sexes. 



I have adopted the generic name proposed in Dejean's Catalogue for Gall, 

 dorsalis Oliv. 



1. Ph. atriventris. Gall, atriventris Say, Journ. Acad. Nat. Sci. Phila., 

 iii. 461; (ed. Lee, ii. 224.) 



1865.] 



