TRICHOPTEIlYGIDiE. 443 



with striae ; some few species of Hister and Saprinus have the 

 elytra marked Avitli red, and a few of the Litter genus are 

 metallic in color. The form of the body is variable ; those of 

 the lirst group are oblong and flat, with prominent mandiljlea ; 

 the others are round, oblong oval, globose, some depressed 

 and some convex. The species live under the bark of trees, in 

 excrement and in carcasses. When disturbed the insects 

 retract the antennae and feet, appearing as if dead. The an- 

 tennas are geniculate, tho eighth and following joints forming 

 a compact annulated, rounded or (rarely) triangular clubo 

 The elytra are truncate behind, leaving two segments of the 

 alidomen uncovered. The linear flattened larvae have the ter- 

 minal ring ending in two l>iarticulated appendages, and a 

 single anal prop-leg. The larva of the European Ulster ^^ 

 merdarius (Fig. 390) lives in cow dung, forming a cell in 

 which it transforms, and like Anthrenus, the pale brown 

 pupa retains the larva skin about it. In Hister the head 

 is retracted ami bent downwards, and the club of the 

 antenna is round and annulated. Hister interruptus 

 Beauv. and A. marginicoUis Lee. arc common northward. Fig. 390 

 The genus Iletcerins difters in the antennal club being 

 obconical, truncate and solid. Tiic species are found only in 

 ants' nests early in the spring. In Scqjrinus the antennae are 

 inserted under the margin of the front ; the antennal cavities 

 being at the sides of the prosternum proper. The species are 

 mostly found in carrion and in dung. 



ScAPHiDiiD^. MacLeay. "This family," according to Dr. 

 Leconte, "contains small oval or rounded oval, convex, very 

 shining insects, living in fungi. The sides of the thorax are 

 oblique, and the head small, so as to make the body somewhat 

 pointed in front ; the thorax is very closely applied to the 

 front, and the elytra are broadly truncate, permitting the tip 

 of the conical abdomen to appear." In Scaphidium the an- 

 tennae are clavate, the eyes emarginate, the posterior tibiae are 

 not spinous, and the first joint of the posterior tarsi longest. 



TiiicnoPTERYGiD.E (Trichoptcrygia Erichson). This incon- 

 siderable family comprises the smallest beetles known. The 



