Dec, 1905.] S\VENK : NORTH AMERICAN SPECIES OF CUTEREBRA. 181 



elytra slightly paler with a large scutellar spot, a transverse fascia 

 slightly behind middle and wider at sides than at suture, black. The 

 thorax is subopa.que and distinctly punctured and the usual setigerous 

 punctures on the alternate elytral intervals are nearly absent ; the 

 tibice are convex on the outer edge. In the Brownsville specimens 

 the suture between the submedian fascia and apex of elytra is narrowly 

 black and from the scutellar spot to the submedian fascia slightly 

 infuscate, while the Mexican specimens seem to have the suture more 

 heavily black; otherwise the specimens agree very well with the 

 description. 



Class I, HEXAPODA. 



Order IV, DIPTERA. 



THE NORTH AMERICAN SPECIES OF 

 CUTEREBRA. 



By Myron H. Swenk, 

 Lincoln, Nebr. 



Recently, while working over the bot-flies in the collection of the 

 University of Nebraska the writer found among them three species of 

 the genus Cuterebra which appeared to be new. Descriptions of these 

 are submitted below, and, in order to show their relationship to our 

 other species and to facilitate their identification, the following table 

 to all the species which have been described from the mainland of 

 North America has been prepared. 



Thorax above with the pubescence yellow (1). 

 Thorax above black, or with black pubescence (5). 



I. Scutellum with black pubescence (Wash.) scutellaris Brauer. 



I. Scutellum with yellow pubescence (2). 



2. A large bare black space on the anterior disc (Ga., Mass.) cuniculi Clark. ^-. 



2. No such bare space on thorax above (3). 



3. Last segment silvery, with yellow pubescence (Mexico) analis Macquart. 



3. Last segment dark, with short black pubescence (4). 



4. Abdomen blue-black (Ga., N. Y., Minn., Nova Scotia) horripilum dark. : 



4. Abdomen reddish brown (Nebr.) abdominalis Swenk. 



5. Pleura mostly yellow or white (6). 



5. Pleura wholly black (15). 



