342 ENTOMOLOGICAIv NEWS. [Oct., 'l/ 



A new Species of Tropidia (Syrphidae) from 



Montana (Dipt.). 



By H. L. Seamans, Bozeman, ^Montana. 



In the Syrphid collection of the Montana Experiment Sta- 

 tion there were several specimens of this insect all collected in 

 Bozeman, on June 20, 1906. There are no notes concerning 

 this particular collection, nor have any specimens been located 

 in all the material collected since that time in the vicinity of 

 Bozeman. In 1916, specimens of this fly were sent to Chas. 

 W. Johnson, at Boston, who determined it as a new species of 

 Tropidia and returned the specimens to this office. Since that 

 time no species of Tropidia has been described, so far as is 

 known, which corresponds to this one. Though it runs near 

 quadrata in the key to the species of Tropidia published by 

 Hunter, in Entomological News (Vol. 7, p. 215), it is entirely 

 different and can be readily separated from that species. 



The following description was made from two type speci- 

 mens, one of each sex, and 18 paratypes, nine of each sex, all 

 perfect specimens. In honor of Prof. R. A. Cooley, of the 

 Montana Experiment Station and State College, the name of 

 cooleyi is suggested for this species. 



Tropidia cooleyi sp. nov. 



Front in both sexes golden sericeous except for keel of carina, and 

 oral margin, which are shiny black; vertex darker than front, covered 

 with a long, dark pile ; cheeks and occiput with covering of j^ellow 

 pile; antennae black, or brown sericeous, first and second segments 

 each with one or more small spines, third segment rounded. Carina 

 of male more acute than that of female, which appears as a rounded. 

 almost globular protuberance below the antennae. 



Dorsum of thorax for the most part black, with a narrow median 

 stripe of .gray flanked by two broader bands of gray extending almost 

 or quite to the scutellum. and with gray bands bordering the pleura; 

 entire thorax covered with golden yellow pubescence. Scutellum 

 shining black, or with tip ochraceous. 



Abdomen black, sparsely covered with yellow pile ; sometimes in 

 females with two more or less distinct grayish spots on second 

 segment. 



Legs black; all knees yellow or ochraceous; hind tibia, and some- 

 times middle tibia with distinct ochraceous band about the middle; 

 hind femur with distinct depression on anterior face near distal end; 

 and equipped at lower distal portion of this depression with a distinct 

 row of short, black spines in the female, and from one to five spines 

 in the male ; all legs covered with yellow pile. 



Wings hyaline, projecting a short distance beyond the tip of abdomen. 



Length from 6 to 7.5 mm. 



