-i83- 



Posterior margin of the fifth segment simple. 



Emargination of the sixth segment (^ as wide as deep capito 



Emargination twice as wide as deep flavicornis 



Elytra much longer than the prothorax ... cinctus 



In his original description oi pallipes, Gravenhorst does not allude 

 in any way to the sexual characters of the male, and his description is 

 perfectly applicable to either pallipes or capito ; the table will therefore 

 serve to establish these species in their mutual relationship. Cinches was, 

 two years after Say's publication, described by Nordmann (Symb. ad 

 Mon. Staph., p. 150), as Cryptobium latericola. This was erroneously 

 printed C. latebricola by Erichson. and so copied by all the more recent 

 authors, perhaps under the very plausible assumption that latebricola is 

 what Nordmann intended to write. Flavicornis Lee, is a smaller species 

 with decidedly narrower head ; it is rare. 



The following new genera are perhaps worthy of description on this 

 occasion : 



MEGASTILICUS n. gen. 



Body robust, sub-depressed. Head rounded, borne on a very slender neck. 

 Eyes rather small. Antennae very short, compact, slightly robust, scarcely perceptibly 

 incrassate. Labrum large, broadly emarginate in the middle at apex, the emargin- 

 ation bidentate. Maxillary palpi very small, moderately robust ; third joint cylindrical, 

 about twice as long as the second, truncate at apex ; fourth joint small, subulate. 

 Legs long and slender ; tarsi cylindrical, the anterior not in the least dilated in the 

 male ; posterior nearly as long as the tibiae, with the first four joints decreasing 

 gradually in length, the first shorter than the next two combined and slightly longer 

 than the filth. 



This is a myrmecophilous genus, peculiar in the structure of the 

 maxillary palpi, in this respect having no near allies which I have seen. 

 The body is remarkably robust. 



M. formicarius n. sp. 



Rnfo-ferruginous ; head and abdomen piceous ; entire upper surface densely 

 granulato-reticulate, rather dull and covered somewhat densely with short erect and 

 very robust spinules ; abdomen smoother and not granulate. Head as wide as long, 

 very slightly wider and longer than the prothorax, the latter hexagonal, widest much 

 before the middle, feebly narrowed toward base, the latter transversely truncate. 

 Elytra slightly wider than long, longer than the prothorax and, toward apex, nearly 

 twice as wide. Abdomen short and broad, in the middle slightly wider than the 

 elytra ; sides arcuate. Length, 5 mm. 



New Jersey ; Massachusetts. 



The male has the apex of the sixth ventral segment deeply sinuate. 



I am indebted for my first specimen of this very singular insect to 

 my friend Mr. W. Jiilich, of New York ; subsequently I received several 

 others through the kindness of Mr. F. Blanchard, of Lowell, Mass. ; 

 whose IMS. name I have adopted for the genus. 



