272 MAINE AGRICULTURAL UXPIjRIMLNT STATION. I909. 



oblique. Halteres yellow. Recorded from the District of 

 Columbia. 



To the above description may be added that between Ri and 

 the radial sector there is a thickening of the wing membrane 

 simulating a longitudinal vein (fig. 90) ; fore metatarsus over 

 two-thirds, the second foretarsal joint one-third as long as the 

 tibia; front tibise suddenly dilated at their tip; thoracic stripes 

 sometimes feebly indicated ; hypopygiivm similar to that of 

 gcniinata. The female specimens which I have seen, some of 

 them coming from the same locality as the males, have black 

 setulffi on the abdomen and rather wide black fasciae ; and the 

 antennae are twice not thrice as long as the body. Penn. and 

 Tenn. (Aldrich), Wis. (Wheeler) and New York. 



10. Macroccra concinna Williston. 



1896. concinna Williston, Trans. Ent. Soc. London. 255. 



Differs from cJara only in having the three stripes on the 

 thorax, a vertical stripe on the pleura, scutellum and metano- 

 tum, brown. It is more probably the same as clara and not 

 inconcinna as Professor Williston has suggested. Recorded 

 from St. Vincent Isl. W. I. 



II. M aero c era sp. 

 A female specimen from Friday Harbor, Washington, taken 

 in July by Professor Aldrich differs from clara in having 

 shorter antennae, but little longer than the insect ; fore meta- 

 tarsus a little over half as long as the tibia ; and feebly indicated 

 thoracic stripes. Venation and markings like cJara. 



12. Macrocera geminata n. sp. 

 Male. Length 4 mm. Head, face and mouth parts yellow ; 

 covering the ocelli a large brownish triangle the vertex of which 

 extends onto the occiput; setae of labrum and vertex black; 

 antennae about six mm. long, fuscous, the scape and the first 

 flagellar joint except the base and the apex of each of the 

 second, third and fourth joints more yellowish. Thorax 

 shining yellow with shining brown markings as follows : 

 the anterior margin of mesonotum with a large triangle, two 

 broad stripes widening posteriorly and nearly meeting in front 

 of the scutellum, a longitudinal dash behind the humeral callus 



