GEOLOGICAL SURVEY OF THE TERRITORIES. 405 



Family I^yg^id^. 



Lygceus, Fab. 



1. L. turcicus, Fab., (Syst. Ehyng-., p. 218, 'No. 61 :) L. reclivatus, Say, 

 (Jour. Acad. Pliila., IV, p. 321.) — The form described as L. reclivatus, 

 Say, differs from the Fabrician only in having the two white dots on 

 the membrane. As specimens with this peculiarity occasionally hatch 

 out of a cluster of eggs of the L. turcicus, laid on the pink Asclepias 

 in Maryland, I do not hesitate to place it as a synonym of that species. 

 Inhabits the United States generally. 



2. L. fasciatus, Dallas, (British- Museum List, II, p. 538, No. 17;) 

 L. aulicus, H. Schf., (Wanz. Ins., VI, Fig. 646.)— Collected in Ari- 

 zona, but common over the greater part of the United States east of 

 the Sierra Nevadas, and extending from Canada to Central America 

 and Brazil. 



3. L. distriangularis, Say, (Heteropt., ISTew Harmony, p. 14, No. 3;) X. 

 marginellus, Dallas, (British Museum List, II, p. 548, No. 51;) L. vicimts, 

 Dallas, (ib., p. 549, 52.) — Inhabits Arizona, California, Texas, Mexico, 

 Central America, and even Venezuela. The L. marginellus corresponds 

 with the type described by Mr. Say; while the L. vicinus, Dallas, is the 

 more common variety, which lacks the red lateral margins to the prono- 

 tum. Other varieties occur which have only a spot of red on the 

 humeral angles ; still others with simply a vestige of red on the pos- 

 terior edge of the pronotum. 



4. L. facetus, Say, (Heteropt., New Harmony, p. 13, No. 2;) L. circum- 

 litus, Stal, (Entom. Zeit., Stettin, XXIII, p. 309.)— This pretty species 

 was obtained by the survey in Colorado. It inhabits, also, Texas, Cali- 

 fornia, Mexico, New Jersey, and Florida. Specimens from Cape Saint 

 Lucas, Lower California, lack the red costal margin of the corium, and 

 usually the red median stripe of the pronotum. The individuals from 

 New Jersey exhibit among themselves a very perceptible variation in 

 the proportionate obliquity of the sides of the pronotum. 



5. L. admiralilis. New species. — Somewhat resembling the preceding, 

 but with the pronotum more nearly quadrate, the sides not so oblique, 

 and the antennsB proportionally more robust. Black, beneath grayish 

 sericeous pubescent; the anterior margin of the pronotum, a short 

 stripe on the base of the lateral margins, a short wedge-shaped streak 

 on the base of the median line, inner margin of the clavus slenderly, 

 and costal and posterior margins of the corium very broadly, red. 

 Head a little longer than broad, much contracted before the eyes, 

 minutely sericeous, grayish pubescent; antennae very stout, almost as 

 thick as the tylus, the basal joint extending a very little beyond the 

 apex of the tylus; the second joint about the same length as the fourth ; 

 the third scarcely more than two-thirds of that length. Uostrum reach- 

 ing behind the posterior coxse. Pronotum remotely, minutely grayish 

 pubescent, having a few shallow punctures behind the transverse ridge; 

 the median ridge quite distinct; the humeral portion of the lateral mar- 

 gin thickened and elevated ; sides of the antepectus with a few coarse, 

 shallow punctures; the punctures of the mediopectus finer, almost obso- 

 lete ; the upper posterior angle of the metapleura a little rounded. 

 Hemelytra minutely sericeous pubescent; the posterior margin of the 

 corium arcuated, sinuated on the middle ; the membrane black, nar- 

 rowly margined at base and all around with white, having four longi- 

 tudinal nervures. Tergum red, the apical segments black; venter 

 minutely sericeous pubescent; the pubescence on the posterior margin 

 of the two apical segments longer. 



