S. W. Williston — North American Conopidm. 385 



covered with rather dense yellowish gray pollen. Legs red, the knees 

 and the tarsi more yellowish. Wings lightly infuscated with brown, 

 the base yellow. 



Hab. Arizona ! 



Three specimens, male and female, from Professor Comstock. 



Myopa clausa Loew. 



S ? . Length, 6-7'""". Face and cheeks light yellow. Antennae 

 red, the second joint distinctly longer than the third. Front darker 

 yellow, with a large Y-shaped brown marking, expanding transversely 

 above the base of the antennae. Upper part of the occiput red, 

 below yellow like the antennae. Dorsum of thorax darker red, 

 usually in the middle in front (extending more or less back) with a 

 broad black stripe, often also on either side, near the middle, with a 

 black spot; pile short, sparse, black. Abdomen lighter red; on 

 each side of the posterior margin of the second, third, and fourth 

 segments with an oval white poUinose spot; fifth and sixth segments 

 with the same pollen, except a semioval space in front. Legs red ; 

 hind trochanters, base of hind femora, and base of all the tibiae, and 

 the tarsi wholly, yellow. Wings moderately infuscated, base yel- 

 low ; first posterior cell usually closed. 



Hab. New England ! 



Eight specimens, Massachusetts and Connecticut. In one the 

 third joint of the antennae is as long as the second. Tlie third joint 

 is often yellowish. In a specimen from Montana the antennae are 

 very distinctly longer, the second joint being elongate ; in another 

 from California the antennae are short, the second and third joints 

 being of nearly equal length ; otherwise these specimens seem to 

 show no differences from the eastern ones. Other specimens from 

 Arizona, Montana, Wyoming, California, Washington Territory, etc., 

 show great variations in size (up to nine or ten mm.) in depth of color, 

 and even in the more oval abdomen, but I am utterly at a loss to find 

 distinctive characters. 



Myopa obliquofasciata Macquart. 



'■'■ Testaeea. Thorace dorso nigro vittis duabus albis. Abdomine 

 oblique albo-fasciata. 



Long. 4 1. $ . Face et front jaunes ; la premiere a duvet blanc ; 

 vertex fauve. Antennes : less deux premiers articles fauves ; le 

 troisieme manque. Thorax a dos noir, avec deux bandes longitudi- 



