306 GEO. H. HORN, M. D. 



P. grossa Fab. — Piceous, feebly shining, elongate oval, elytra maculate 

 with paler spots. Head coarsely punctured, front transversely impressed. 

 Thorax twice as wide as long, apex a little narrower than base, sides moder- 

 ately arcuate, posteriorly distinctly sinuate, hind angles subacute, apex deeply 

 emarginate, base feebly bisinuate, margin explanate, feebly reflexed, disc 

 vaguely impressed each side of middle, surface coarsely and moderately densely 

 punctate. Elytra as wide as the thorax, sutural angle slightly rounded, disc 

 feebly subcostate, each ridge with a row of fine punctures bearing a short hair, 

 intervals vaguely triseriately punctate, color piceous maculate with paler spots, 

 one each side of scutellum, an oblique row of three spots, the outer humeral 

 the inner at the middle of the suture, behind this row another similar one of 

 three spots. Body beneath densely punctate, the abdomen less so than the 

 raetasternum. Length .24 — .34 inch; 6 — 8.5 mm. 



This is our largest Nitidulide with the exception of an Ips. 

 Occurs from Canada to Texas. 



OMOSITA Erichs. 



Labrum entire. Front not lobed at the sides. Antennal grooves 

 moderately deep, feebly convergent beneath. Point of prosternum 

 not prolonged. Tarsi moderately dilated. 



There is no additional segment in the males. 



Two species occur in our fauna, identical with those of Europe, 

 but probably equally native to our continent and not introduced. 

 They are so abundant and well known that no detailed description 

 need be given. 



O. colon Linn. — Piceous, elytra spotted with testaceous, a large apical 

 testaceous space enclosing on each side a small piceous spot. Length .10 — .14 

 inch; 2.5 — 3.5 mm. 



Eastern United States and Europe. 



O. (liscoidea Fab. — Somewhat more elongate than the preceding, simi- 

 larly colored except that the large pale space is basal. Length .10 — .16 inch ; 

 2.5 — 4 mm. 



Occurs in Europe and in the Pacific States, extending as far east 

 as Colorado. 



SOROMIA Erichs. 



Labrum emarginate or feebly bilobed. Mandibles with an acute 

 cusp behind the tip, apex simple not bifid. Front distinctly lobed 

 over the insertion of the antennse. Antennne terminated by the usual 

 club, received in grooves under the eyes, either parallel or slightly 

 convergent, first joint always auriculate but variably in extent. Tarsi 

 extremely feebly dilated. 



The males are as in Phenolia. 



Under this head Mr. Reitter has united Soronia^ Lohiopa and 

 Phenolia. T fully agree with him as to the first two but not the last,, 



