AKT. 17. I.TORTH AMERICAN PHOROCERA — ALDRICH AND WEBBER. 49 



antennae black, the third joint three times the second ; arista thick- 

 ened on basal half, its penultimate joint twice as long as wide; palpi 

 rather long and slender, yellow; probocis short; bucca (below the 

 eye) more than one-third of the eye height. 



Thorax black with gray pollen forming the usual changeable 

 stripes. Posterior dorsocentral bristles 3 with sometimes a small 

 fourth one; sternopleurals 3; scutellum witii 3 lateral bristles the 

 apical pair veiy slender, hair-like. 



Fig. 1. — Fhorocera slossonab Townsend, Male Genitalia, Mdch JIniarged. (Dhawn 



BY Chas. T. Gebene.) 



Abdomen with dense gray pollen forming a changeable pattern, 

 the hind margins of the segments more or less shining; discal mac- 

 rochaetae on the second, third, and fourth segments; a large mar- 

 ginal pair on the first segment; genit<il segments bhick [genitalia, 

 fig. l]ythe inner forceps united to form a boat-shaped structure with 

 a decided keel behind and suddenly narrowing apically into a slightly 

 curved beak ; the outer forceps broad and shining, closely appressed 

 to the under surface of the second genital segment, and tapering 



