36 IOWA STUDIES IN NATURAL HISTORY 
Pangaeus bilineatus (Say) (Puate I, Ficure 4) 
1825. Cydnus bilineatus Say, Journ. Acad. Nat. Sci. Phila., IV, 315. 
1839. Cydnus femoralis H.-S., Wanz. Ins., V, 98, fig. 548. 
1859. Cydnus bilineatus Say, Compl. Writ., II, 242. 
1876. Pangaeus bilineatus Stal, Svensk. Vet. Handl., 14, no. 4, 10. 
1877. Pangaeus bilineatus Uhler, Bull. U. S. Geol. Geogr. Surv., III, 386. 
1878. Pangaeus bilineatus Uhler, Proc. Bost. Soe. Nat. Hist., XIX, 971. 
1882. Pangaeus bilineatus Signoret, Ann. Soc. Ent. France, II, Ser. 6, 254, PI. 
Ne sites “ala lsy 
1904. Pangaeus bilineatus Van Duzee, Trans. Am. Ent. Soc., XXX, 24. 
1911. Pangaeus bilineatus Zimmer, Uniy. Neb. Contrib. Dept. Ent., no. 4, 24. 
General form oval. Color black to deep black, highly polished; legs and 
rostrum paler, the antennae much paler. Head bluntly rounded and usually 
strongly margined; submargin with heavy, erect, remote bristles; surface of 
lateral lobes obliquely wrinkled; tylus usually as long as lateral lobes and 
with four or five shallow, transverse grooves anteriorly; base of head con- 
vex, impunctate, shining, convex. Ocelli very large, yellow or reddish. 
Antennae stout, yellowish brown, thickly haired, the second segment a little 
longer than the third. Rostrum yellowish brown, heavy, reaching between 
midcoxae. Pronotum gradually and moderately narrowing anteriorly, the an- 
terior angles a little prominent, the edges reflexed and the lateral submargin 
with seven or eight cilia; surface moderately convex anteriorly but flatter 
posteriorly; transverse line on the middle distinctly impressed, sparsely, 
irregularly punctate, ending laterally in a more or less distinct depression 
anterior and posterior to which are usually large, sparsely and irregularly 
placed punctures; median anterior and posterior portions of pronotum with- 
cut punctures; humeri rather prominent, prolonged forward into a kind 
of ridge; anterior submargin with a deeply impressed line. Scutellum 
large, slightly convex at base, somewhat depressed at apex, coarsely, 
sparsely, irregularly punctate; apex angularly rounded; lateral sub- 
marginal line deeply impressed, reguiarly and finely punctate. Corium 
irregularly rugulose, moderately finely, sparsely and irregularly punc- 
tate; a single row of punctures on either side of the cubital vein; punc- 
tures on and near clavus regular, coarser; costal margin with three or 
four bristle-bearing pits; membrane yellowish brown and considerably 
longer than abdomen. Venter smooth, impunctate, the posterior edges 
of the segments either side of median line finely serrate; connexivum 
reugh and uneven; last complete ventral segment in both sexes with a 
long bristle on each side of median line near apex. Ostiolar canal large, 
covered in front by a convex ridge which is indented on the posterior 
margin near the tip leaving a small angulate lobe at the extremity; 
ostiolar plate concave and very finely rugulose on internal three-fourths. 
Legs reddish-black; anterior femora distinctly enlarged, somewhat an- 
gulate; anterior tibiae moderately exparded, the upper surface with trans- 
verse depressions; outer edge with eight or nine long curved spines, the - 
tip with three or four and the inner margin near the apex with a very 
long, slender oblique one; middle and posterior tibiae rather closely and 
