ART. 10 TROPICAL AMERICAN DIPTERA — VAN DUZEE 43 



yellow; fore tibiae yellow on outer surface, white on upper and inner 

 sides, the upper surface broad, flattened or a little concave, glabrous, 

 on each edge with a row of close set, short, black hairs ; inner surface 

 also somewhat flattened and mostly glabrous on apical half or more; 

 middle and hind tibiae yellow, the latter a little blackened at tip. 

 Fore tarsi with the first joint white, sharply black at tip, its hairs 

 black; middle tarsi black from the tip of the first joint, yellow at 

 base ; posterior tarsi mostly black. Joints of fore tarsi as 26-8-7-5-7 ; 

 of middle ones as 42-20-14:-10-10 ; joints of posterior pair as 32-33- 

 17-14-10, Calypters, their cilia and tJie halteres j^ellow. 



Wings grayish; costa without enlargement; last section of fourth 

 vein abruptly bent near the middle, beyond the bend conspicuously 

 arched, ajjical fourth nearly parallel with third vein, which is a very 

 little bent back toward its tip ; last section of fifth vein 20, cross vein 

 twenty-two fiftieths of a millimeter long; fourth vein ending in the 

 wing margin a little before the apex of the wing. 



Described from one male, taken by Nathan Banks, July 26, 1924, 

 at Barro Colorado Island, Panama Canal Zone. 



Type. — In the Museum of Comparative Zoology. 



PARACLIUS SIMPLEX, new species 



Male. — Length 3.6 mm. Face silvery white, narrow below, wider 

 above, reaching slightly below the eyes; front shining blue; antennae 

 yellow with upper edge black, third joint nearly round in outline; 

 lateral and inferior orbital cilia whitish. 



Thorax green, dorsum with blue reflections, pjeurae with white 

 pollen. Abdomen green, more or less of posterior part of segments 

 purple, sixth segment extending a little over the hypopygium, small, 

 yellow with a black tip. Hypopygium greenish black, large and 

 closely applied to the venter, with two spots of white pollen at base ; 

 its lamellae yellow, of moderate size and as near as I can see of a 

 circular shape. 



Fore coxae wholly yellow with black hair and bristles ; middle and 

 hind coxae largely black; femora and tibiae yellow, extreme tips of 

 posterior pair a little brown; tarsi black from the tip of the first 

 joint, hind tarsi with the black extending nearly to the base on one 

 side and with a long bristle at base below. Joints of fore tarsi as 

 30-10-7-6-6; those of middle ones as 44-26-18-10-10; first two 

 joints of posterior pair as 35-39. Calypters and halteres yellow, the 

 former with black cilia. 



Wings uniformly tinged with brown; costa without an enlarge- 

 ment; third vein a little bent back at tip; last section of fourth vein 

 bent a little before its middle, conspicuously arched beyond the 



