470 BULLETIN UNITED STATES GEOLOaiCAL SURVEY. 



elytra milky-white, with a yellowish cloud at base, another behind the 

 middle, and a third at tip; or with ouly a trace at base and a cloud from 

 before the middle to the tip, or all these .wanting ; the nervnres brown, 

 darker at tip, the one between the clavus and coriam testaceous or ocher- 

 ous; transverse nervules of the costal area, a few ramose nervules on 

 the disk and behind it, a macular open band before the middle, a similar 

 one behind the middle, and some traces and an irregular circle at tip, 

 together with broad margins of the nervures, dark brown; wings whit- 

 ish, with brown nervures, and highly iridescent; the three apical are- 

 oles blunt and broad. Venter black at base, testaceous beyond, and rosy 

 at tip, the valves being set with long, remote, stout, white bristles; ter- 

 gum testaceous, black on the disk. ^3H 



Length to tip of venter 4f-5^ millimeters ; to tip of hemelytra 5^Jfl^H 

 6^ millimeters. Width of pronotum l|-2 millimeters. 



One specimen from Manitou, August 13; other specimens from Mary- 

 land, August 10, and from Texas. 



The translucent hemelytra, with the clear browu marking in such 

 strong contrast, give this species a very lively appearance, and signalize 

 it as one of the most marked of its group. 



4. J. plutonius, new sp. 



Deep black, robust, the head a little more tumid and angular at tip 

 than in the preceding species. Head, including the eyes, wider than 

 the pronotum, black; the vertex triangularly lunate and a little tumid 

 anteriorly ; each side near the eyes with three dots, a dot at tip, a short 

 line on the middle, anteriorly ; four curved lines each side, the posterior 

 margin, and the margin of the eyes orange; front prominent, obliquely 

 declining, a little flat inferiorly, the transverse lines interrupted in 

 the middle, orange, and with an orange geminate spot adjoining the 

 ocellus, one a little lower down, a small one on the inner cheek, a 

 large one on, and the margin of the outer cheek, the central line of 

 the front, a spot at its tip, and a large spot each side of the base 

 of tylus, orange; antennoe piceous, the base of the first joint yellow. 

 Pronotum long-sublunate, moderately convex, convexly decurving 

 each side, black, marbled, and flecked transversely, and slenderly mar- 

 gined with orange; the spots on the middle next the anterior margin 

 and two or more each side of these larger; the lateral margin broadly 

 orange, very short, and continuous with the anterior margin ; the an- 

 terior margin convexly decurving beneath the eyes ; the latero- posterior 

 margin moderately long, a little oblique, arcuated, with the angles much 

 rounded ; the posterior margin almost straight ; the decurved sides very 

 short, black, contracted, and sinuated above. Mesopleura very large, 

 the metapleura shorter, triangular, both black and margined with yel- 

 low. Coxse black, partly margined with yellow ; femora black, banded 

 beyond the middle and at tip with testaceous; tibiae pale testaceous, 

 more or less clouded with piceous; tip of tarsi piceous. Scntellum black, 



