HARPALIN/E 135 



Body of peculiar facies, depressed, the prothorax strongly cordiform, with 

 the base very much narrower than the apex; elytra with the series 

 of punctures very irregular, generally not adjacent to the striae, the 

 scutellar stria very feeble or obsolete; ligula very slender, distinctly 

 shorter than the paraglossae; labial palpi slender, the second and 

 third joints subequal in length, the third rapidly acuminate at tip. 

 Sonoran regions Selenalius 



7 Body nearly as in Discoderns but with less developed head and pro- 

 thorax, the latter more cordiform than in any species of that genus. 

 Atlantic regions Gynandropus 



8 Body oblong-oval, convex, the anterior and middle tarsi (c?) not 

 appreciably dilated, though having beneath a double series of very 

 small squamules; integuments always dark in color. North America, 

 excepting the true Pacific faunal regions Discoderus 



9 Body oblong-oval and convex as in Discoderus, but with the anterior 

 and middle tarsi (c?) strongly dilated and biseriately squamulose 

 beneath as usual, the middle tibiae not modified; integuments pe- 

 culiarly pallid though dense as in Geopinus. Mississippi River 

 Valley Hartonymus 



Hemisopalus n. gen. 



In this genus, which will include a considerable proportion of 

 the species previously placed in Selenophorus by Putzeys, LeConte, 

 Bates and others, we occasionally observe fine punctures pervading 

 the entire elytra, but they never have the character so notably 

 developed in Athrostictus Bates. The species at present in my 

 collection may be defined as follows: 



Hind angles of the prothorax rounded 2 



Hind angles not obviously rounded, though sometimes very obtuse. . .8 



2 Elytra with strong and very evident prismatic iridescence 3 



Elytra without pronounced iridescence, though very shining and some- 

 times with submetallic lustre; upper surface much more convex. .6 

 3 -Larger species 7-10 mm. in length, elytra with more or less sparse 



but obvious suffused punctulation throughout 4 



Small species, not over 6 mm. in length and of very depressed form, the 



suffused punctulation obsolete 5 



4 Form oblong, very moderately convex, black, polished in both sexes 

 throughout, the margins of the pronotum finely testaceous and the 

 elytra with obvious iridescence, the under surface black, with feeble 

 metallic glint; legs and cephalic appendages pale testaceous; head 

 rather short, with well developed and prominent eyes, the foveae 

 extremely minute and feeble, the antennae very slender; prothorax 

 one-half wider than long, the sides subparallel, evenly and moder- 

 ately arcuate, the apex sinuate, with rather advanced though rounded 

 angles and much narrower than the base, which is transverse and 

 finely margined, with obtuse and evidently rounded angles; surface 



