AMERICAN OOLEOPTERA. 51 



This remarkable insect has the form and all the essential characters 

 of MlcropepUdse (9-jointed antennae with solid club, 3-jointed tarsi, 

 widely separated hind coxse, etc.), but differs remarkably by its sculp- 

 ture; the elevated lines of the head, prothorax and abdomen are quite 

 absent, and the costae of the elytra are represented by only two pairs 

 of impressed lines which converge towards the base, with interspaces 

 becoming slightly elevated. The antennae are longer and more slender 

 than in Micropeplus. 



The last ventral segment in the % is longitudinally impressed, the 

 middle and hind tibiae are bent inwards near the tip. 



K.. nitidus. — Broadly oval, rounded in front, obliquely narrowed behind 

 the elytra; head with a triangular impression on the vertex, connected with a 

 transverse frontal line ; prothorax strongly narrowed in front, twice as wide 

 as long, rounded on the sides, bisinuate at base, bind angles not rounded, disc 

 smooth, very convex, sides very broadly depressed, alutaceous ; elytra with 

 two pairs of lines converging towards the base, interspaces costiform at the 

 base, but becoming flat behind; disc convex, apical margin depressed, humeri 

 not rounded; abdomen with five exposed segments, smooth, conical, not mar- 

 gined, about two-thirds as long as the elytra. Length 1.5 mm. 



Vancouver Island; Mr. Crotch. On pebbly margins of a small 

 lake near Gold Stream, in July. 



GEORYS^SUS Latr. 



G. californicns.— Dull black, prothorax finely channelled, a little longer 

 than wide, anterior lobe separated by a more distinct transverse impression 

 than in G. pumilus Lee, and more deeply rugose ; elytra with rows of quad- 

 rate punctures which are narrower than the intervening spaces. Length .07 

 inch ; 1.8 mm. 



California; Dr. Horn. This species is mentioned in Mr. Crotch's 

 Check List, from the collections of Dr. Horn and myself, but has not 

 been described. It is quite distinct from G. pumilus by the smaller 

 and more distant rows of punctures of the elytra. The last named 

 species has an extensive range, being found in Kansas, Canada and 

 Massachusetts. 



THROSCINVS, n. g/ {Parnid<z.) 



Body elongate oval, obtuse at each end, clothed rather densely with 

 short suberect pubescence. Head protected beneath by a large lobe 

 of the prosternum; eyes oval, rather finely granulated, not hairy; an- 

 tennae inserted in front of the eyes, 11-jointed, slender, nearly as long 

 as the prothorax ; 1st and 2d joints stouter, not longer than the 3d 

 and 4th united, which are slender, 5th a little wider and shorter, 6 

 — 10 a little wider, subtriangular, 11th oval, not longer. Palpi with 



