382 C. R. OSTEN SACKEN'S PRODROME 



arc somewhat variuljle. The followuig segments are black, with yellow sides and posterior 

 margins. Venter yellowish at the base, black at the end, the relative extent of both 

 colors being variable. Legs : prevailing color reddish, with more or less brown at the base 

 of the hind femora, the tip of the hind tibia) and the ends of the four posterior tarsi, the 

 latter half of the front tibiie and the front tarsi brown. Wings : costal cell infuscated, the 

 brown also occupying the proximal third of the first basal cell and encroaching very 

 slightly upon the second ; crossband limited posteriorly by the intercalary vein, Ijut fdling 

 out the fourth posterior cell and thus reaching the hind margin ; last section of the fifth 

 vein enveloped in a brownish cloud ; the interval between this cloud and the crossband is 

 hyaline. The hyaline triangle, separating the crossband from the apical spot does not 

 reach anteriorly beyond the second longitudinal vein ; thus the apical spot coalesces with 

 the crossband within the marginal cell ; posteriorly, the apical spot reaches a little beyond 

 the apex of the wing. 



Hah. Massachusetts (Beverly, Cambridge, etc.,) collected by Messrs. Burgess and San- 

 born ; three females. A fourth female specimen, belonging to the Entomol. Soc, Philad., 

 therefore probably from the Middle States, agi'ees in all particulars with the others. 



Observation. Two female specimens (Illinois and Red Eiver of the North, by E. Ken- 

 nicott), which I have before me, differ in some particulars from the tj-pical specimens of C. 

 jnidicus. The crossband does not reach the hind margin, a considerable portion of the 

 fourth posterior cell not being fdled out with brown ; the ajiical spot is somewhat narrower, 

 the cloud on the last section of the fifth vein communicates with the crossband across the 

 base of the fifth posterior cell ; the apex of the A-shaped spot on the second abdominal 

 segment coalesces with the black on the first segment, etc. This is probably a distinct spe- 

 cies. 



12. Chrysops montanus n. sp. 



9 . Apical spot connected with the crossb.ind, hyaline ti'iangle between them not crossing the second lon- 

 gitudinal vein ; both basal cells nearly hyaline, and only a little infiiscated at the proximal end ; frontal 

 callosity black ; fiiclal tubercles yellowish-ferruginous; third and fourth abdominal segments with four black 

 longitudinal sjiots, alternating with yellow ones. 



Length, 8 mm. 



Fenv.de. Face (inchtding the facial callosities), yellowish-ferruginous; palpi reddish- 

 3'elIoAV ; antenna) : first two joints reddish, the second mixed with black ; both beset with 

 blitck hairs ; third joint black, somewhat reddish at the base. Frontal callosity black ; front 

 with yellowish-gray pollen. Thorax with the usual stripes, the intcimediate one with a 

 slightly more yellowish tinge than in C. rubcns, the lateral ones yelIow^ Abdomen : first 

 two segments yellow; the first with a blackish spot in the middle, under the scutelliim ; 

 the second with a A-shaped black spot, both branches of which are less divaricate than in 

 C. ruhens ; in my three specimens this spot does not coalesce anteriorly with the spot of 

 the first segment ; the third segment shows four longitudinal black spots on j-ellow ground ; 

 the intermediate pair, which is the broader, is connected anteriorly, with the branches of 

 the A-shaped spot, and posteriorly, with similar spots on the fourth segment ; the lateral 

 sjDOis of the third segment are continued only posteriorly by similar spots in the next seg- 



