A New Species of Pelecocera. 



BY W. A. SNOW. 



The three genera of Syrphidae whose antenrite have a terminal style 

 instead of a dorsal bristle or arista, are Cerm Fabr. , Callicera Panz., 

 and Pelecocera Meig. Of the latter, four European species have been 

 described. One of these, P. sarvoides Fall, differs from the other 

 members of the genus in that its antennal bristle is dorsal instead of 

 terminal, and not stilliform. The only American species hitherto 

 known is /". /<?;xrt!«^/^/' Will.,* which has a thick three-jointed term- 

 inal style. Recently collected specimens from New Mexico, belong- 

 ing to a new species, agree in antennal structure with scirvoides and 

 suggest the advisability of forming a new genus founded upon scce- 

 voides and ivillistonii. 

 Pelecocera ■willistonii n. sp. 



Female. Black, shining. Head concolorous. Front one-third the 

 width of the head, with a shallow horizontal depression at the middle; 

 pile whitish at the vertex, below a little dusky; sides beneath the 

 depression, silvery pollinose. Antennae reddish-yellow, black on the 

 upper edge of the third joint; first two joints small; articulation of 

 the second and third joints above the middle of the latter; third joint 

 round, plate-shaped; arista black, arising from the middle of the 

 dorsal edge of the joint, comparatively slender, thickest at base, 

 indistinctly jointed, pubescent. Face at the sides yellow, silvery 

 pollinose; in the middle shining black; concave beneath the antennae, 

 then broadly convex below, descending a short distance beneath the 

 eye; cheeks brownish. A silvery pollinose spot on the humeri which 

 extends to the base of the wings; scutellum with two weak sub-apical 

 black bristles. Abdomen brownish black, shining, immaculate, long, 

 narrower than the thorax. Legs yellow, covered with short silvery- 

 pile; hind femora broadly infuscated in the middle. Pile of the 

 whole body sparse and white. Wings hyaline, stigma dilutely yellow. 



Length 5 mm. 



This species is distinct from the European sccevoides in its uni- 

 colorous abdomen. 



■ Synopsis of N. A. Syrphidas, p. 110 



(187) KAN. UNIV. gUAK., VOL. HI., NO. 3, JAN., 1895. 



