AET, 10 TROPICAL AMERICAN DIPTERA VAN DUZEE 5 



composed of several long liairs at tip of abdomen, these are as 

 long as the last three segments taken together. 



Coxae and femora green, fore coxae with white hair and two 

 black bristles; all femora witli long pale hairs below, extreme tip:i 

 of fore and middle femora brown; all tibiae and fore and middle 

 tarsi yellow, tips of fore and middle tarsi, the whole of posterior 

 tarsi and extreme tips of hind tibiae black. Fore tibiae with four 

 bristles of rapidly increasing length, the last about three-fourths ag 

 long as the tibia; middle tibiae with two long bristles above and 

 three very short ones below. First joint of fore tarsi (fig. 6) with 

 eight very long bristles of increasing length; second and third joints 

 each with one long slender bristle near the tip; middle and hind 

 tarsi slender, plain; joints of fore tarsi as 89-35-30-18-6; those of 

 middle ones as 107-36-28-1^8; joints of posterior pair as 87- 

 29-21-14t-7. Calypters and their cilia black; knobs of halteres 

 yellow. 



Wings grayish; costa with only very short hair; first vein reach- 

 ing to the middle of the wing; cross vein oblique; fork of fourth 

 vein extending backward, the angle being less than a right angle; 

 cross vein 50, last section of fifth vein 21, fourth vein from the cross 

 vein to the fork 37 and from the fork to wing margin twenty- 

 fiftieths of a millimeter long. 



F&tnale. — Five females taken at the same place and day as one 

 of the males described above, agree with the males in the form of the 

 face, antennae, venation of wings and color of the coxae, femora and 

 tibiae; the fore and middle tarsi are brownish toward their tips; 

 the hairs on second antennal joint are about as long as the antenna; 

 fore femora with long bristly hairs like those of the male, longer 

 than the second joint of middle tarsi; fore and middle tibiae each 

 with three long bristles; fore basitarsus without cilia or long hair, 

 but with a few minute spines ; joints of fore tarsi as 74-22-16-12-7 ; 

 those of middle ones as 7-^28-17-9-6; joints of posterior pair as 

 69-26-16-11-6. 



Described from tv.'o males and six females, taken by J. M. Aldrich, 

 April 14 and 16, 1926, at La Providencia, Siquinala, Guatemala ; and 

 one male taken at the Tropical Research Station, New York Zoologi- 

 cal Society, British Guiana, the last returned to the American 

 Museum, New Yorli. 



Type.— Male, Cat. No. 41028, U.S.N.M. 



This form is very much like comatus Loew ; the form of the 

 hypopygium, face and fore tarsi, and the venation of the wings are 

 the same, but this has two stouter and shorter bristles on middle 

 tibiae and no cilia at all on middle tarsi ; in coraatus there are three 

 bristles on middle tibiae of rapidly increasing length, the last one 

 very long and slender, and the middle basitarsi have long conspicu- 



