E. T. CRESSON, JR. 285 



This species is well figured in the Biol. Cent.-Ani., Vol. II. It 

 will fall in the subfamily Ulidiinse, but its unusally long antennae 

 separates it from all others of that group. 



The genera Stictomi/ia and Paixedopa may be separated as follows : 



1. Head conspicuously large ; antenuje situated as far or further apart than the 



length of the first two joints ; cheeks and face swollen la. 



Not having these characters 2a. 



la. Eyes round, about one-half height of head 2. 



Eyes higher than long, more than one-half the height of head. 



Paroedopa Coq. 



2. Third joint of antenuae round, front smooth, not rugose CEdopa Lw. 



Third joint of antennae elongate, upper part of front rugose. 



Eiiryeephala Roed. 

 2a. Antennae much longer than face; face with two large shining callosities be- 

 neath the antennae, not concave Stictoniyia Biq. 



AntenuEe not longer than face; face with no callosity, flat or concave. 



3 of manual. 



This table is to be used in connection with that given under 

 Ulidiina3, page 118 of Williston's Manual of the Families and 

 Genera of North American Diptera (2nd edition), and is numbered 

 to correspond with it. 



Acrosticta bieolor sp. nov. (P\. VI, figs. 8, 9, 10). 



Dull green and black, excepting the tibia, tarsi and the second and third abdo- 

 minal segments. 



Head nearly twice as wide as high, and about as long, generally black. Front 

 broad, smooth, one and a quarter times as wide as the eye, uearly horizontal, not 

 punctate or rugose, somewhat depressed, projecting forward at the antennae, 

 covered with minute hairs, dark brown near the antennae, but black at vertex; 

 orbits parallel, dusted with white; one pair frontal bristles. Face black or very 

 dark brown, wide, in profile slightly excavated only in % , but the foveae rather 

 deep; polliuose beneath the antennae; carina wide, obtuse, minutely grooved 

 in front above the oval margin. Cheeks black, about half as wide as the eye 

 height. Posterior orbits greenish. Occiput flat. Clypeus black, distinct, small, 

 not projecting forwards. 



Antennae black, rather elongate ; third joint about twice as long as wide, nearly 

 half as thick as wide, rounded at apex ; arista distinctly thickened at base. Pro- 

 boscis black, short, robust. Palpi black at tip, nearly filiform. 



Thorax dull bluish green, thickly pollinose above, slightly so on the pleura, 

 narrower than the head, somewhat longer than wide; bearing one pair post 

 dorso-centrals, one pair post acrosticals, two superalars, two post humerals, one 

 humeral, one prealar, one mesopleural, one steruopleural, otherwise covered with 

 scattered minute hairs. Scutellum shining green, convexed, pointed, bearing 

 four marginal bristles. Squamulae snow-white. Halteres white. 



Abdomen semi-shining green, excepting the scarlet posterior half of first, all of 

 second, and anterior half of third segments elongate, as long or longer than the 



TKANS. AM. ENT. SOC. XXXII. OCTOBEE, 1906. 



