AMERICAN COLEOPTERA. 1G5 



The elytra are still more finely punctured, and tliougli somewhat 

 longer in this species than in vulpiim and yet shorter than in lupina, 

 they are also more divergent along the suture than in either of the pre- 

 ceding species. This species is, without doubt, identical with that 

 mentioned by Doubleday as having occurred in Oregon, though pro- 

 bably considered by him as identical with lupina. Occurs near Fort 

 Klamath, Oregon. For this interesting addition to our western fauna, 

 I am indebted to Mr. Wra. M. Gabb, Palaeontologist Cal. Geolog. 

 Survey, whose kindness in placing his collection at my disposal, lias al- 

 ready been acknowledged. 



ACRATTJS, nov. gen. 

 Head elongate, epistoma trapezoidal, narrower anteriorly, concealing 

 the parts of mouth beneath, separated from the front by a sinuous im- 

 pressed line, anterior edge margined and notched. Labrum small, 

 transverse, not emarginate. iMandibles short, coriaceous on the inner 

 margins and ciliate internally at apes. Maxillae elongate, ciliate with 

 curved spinous hairs at apex. Palpi long, last joint fusiform. jMen- 

 tum trapezoidal, longer than broad, narrower behind, anterior angles 

 rounded. Ligula distinct from the mentum, coriaceous and deeply 

 bilobed. Palpi very small, last joint somewhat longer. Antennae ten- 

 jointed, first and second thick, third — seventh small, eighth — tenth 

 forming a suboval mass. Abdomen six-jointed, joints, except the last, 

 connate. Pygidium exposed. Tarsi slender, claws small and divided. 

 Anterior tibiae tridentate externally, with a small spine internally, mid- 

 dle and posterior tibiae bispinose, the latter broad and triangular, and 

 with one transverse ridge. 



The accompanying wood-cuts represent magnified views of the parts 

 of the mouth, an antenna, and an anterior leg and one of the tarsal 

 ^_^ '/I claws of ArratHs. The 



"^ 1^ ^ parts have, however, been 



^ ^=^2> ^I'^S^^'fi^d in different de- 

 2^ grees, as will be seen by 



■^ — -^ a comparison of the men- 



tum and the maxilla ad- 

 joining it. In nature the hairs at the tip of the maxilla are even more 

 curved than represented. Both claws on all the feet are deeply cleft 

 to within a third of the base, the inferior portion being a fourth shorter 

 than the superior. 



This genus recalls strikingly the characters of Chnaunanfhux of the 

 Sericoidini, and from the description, by which it is alone known to 



