524 TRANSACTIONS OF THE 



lar terminal joiat of the maxillary palpi is a trait in common with 

 Bemhiditim Bon. 



A. HELLUONis. — Head black ; thorax rufous ; elytra blue. 



Inhabits Pennsylvania. 



Head punctured, somewhat hairy ; eyes small, almost equidis- 

 tant [412] between the tip of the mandibles and the thorax ; an- 

 tennae, first and second joints pale rufous; labrum yellowish-ru- 

 fous ; mandibles piceous ; palpi pale yellowish rufous ; thorax 

 punctured, excepting along the dorsal middle ; elytra destitute 

 of striae or punctures, blue, with a purplish reflection ; feet and 

 postpectus pale yellowish ; knees and tarsi brownish. 



Length three-tenths of an inch. 



The intermediate feet and the antennae, excepting the first and 

 second joints, are deficient in this specimen. I am not sure 

 whether I obtained it on our journey to the Rocky Mountains, 

 to St. Peter's river, or in Pennsylvania, but I think the latter. 



[No insect has yet been seen by other entomologists, which at 

 all approaches the description here given. With regard to the 

 systematic relations which such an object would have, it is quite 

 obvious that it should not be placed with the Carabidse, since 

 the mentum transverse, simple, destitute of auricles, is altogether 

 foreign to the Adephagous series. This form of mentum, with the 

 subulate palpi and bilobate labrum, fix the head, at least, as be- 

 longing to a Staphi/luiide. In that family the insertion of the 

 antennae, form of palpi, ligula and mandibles, prove conclusively 

 that it enters the group Psederini. In fact, there is nothing in 

 the description of the head, thorax and anterior legs, which for- 

 bids a reference to Cryptohium hlcolor or C. melanocejjhalum. 

 With regard to the elytra and posterior legs, I must suppose them 

 to have been derived from some foreign Carahide, and that the 

 union was efi"ected unintentionally, before the specimen came 

 under Say's notice. — Leg.] 



CASNONIA Latr. 



C. RUFiPES Dej. — The insect of this genus represented by 



Drury (Ins. 1, pi. 42, f. 4 and 6) is probably a variety of this 



species. Dejean has not noticed this figure at all. The Galcrita 



americana is represented in the same plate. 



[Vol. IV. 



