June, 1905. J CoQUILLETT : DlPTERA FROM NORTH AMERICA. 57 



Eureka, Cal. A specimen of each sex collected in coition June 5 

 by Mr. H. S. Barber. Type No. 8343, U. S. National Museum. 



Limnobia maculicosta, new species. 



Marginal crossvein far before apex of first vein, wings spotted, femora without 

 brown bands. Head and its members brown, the labella yellow, joints of antennae 

 except the second longer than broad, the eighth over twice as long as broad. Thorax 

 somewhat polished, brown, varied with yellow. Abdomen brown, a band near base 

 of seeond segment, the extreme bases of the other segments, the genitalia and the 

 broad bases of the segments of the venter, yellow. Legs brown, broad apices of the 

 femora, both ends of the tibire and bases of the tarsi yellow. Wings hyaline, indis- 

 tinctly mottled with pale gray and with four rather large, dark gray spots along the 

 front margin — one at base of second vein, another at apex of auxiliary vein, a third 

 on the marginal crossvein, the last one at apex of first vein ; the first spot extends 

 only to the auxiliary vein, the other three border the costa ; auxiliary vein nearly 

 reaches the base of the submarginal cell and apparently ends in the first vein, with 

 the crossvein a short distance before its apex. Halteres brown, both ends yellow. 

 Length 11 mm. 



Kokanee Mt. , British Columbia (altitude 8000 feet). A female 

 specimen collected August 10 by Mr. R. P. Currie. Type No. 8344, 

 U. S. National Museum. 



Limnobia bestigma, new species. 



Near tristigma but with only two brown costal spots — one at apex of auxiliary 

 vein, the other on the marginal crossvein. Head and its members brown, the third 

 joint of antennae and the labellse yellow /joints of antennae except the second longer 

 than broad, the fifth and following joints over twice as long as broad. Thorax some- 

 what polished, yellowish, a median brown vitta on the anterior half, sides of scutel- 

 lum also brown. Abdomen brown, a median vitta, the genitalia and venter yellow. 

 Legs yellow, broad apex of each femur and tarsus brown, an indistinct brownish band 

 at a considerable distance from the apex of each femur. Halteres elongated, yellow. 

 Wings hyaline, a rather small brown cloud at apex of auxiliary vein and a slightly 

 larger one on the marginal crossvein : the latter cloud is located nearly in the middle 

 of the otherwise pale yellowish stigma ; apex of auxiliary vein slightly beyond middle 

 of first section of second vein, its termination and the crossvein as in the preceding 

 species ; marginal crossvein far before apex of first vein. Length 9 mm. 



Bear Lake, British Columbia. A female specimen collected July 

 29 by Mr. R. P. Currie. Type No. 8345, U. S. National Museum. 



Rhypholophus divergens, new species. 



Near holotrichus, but the sixth and seventh veins diverging toward their apices, 

 etc. Black, the halteres, trochanters and bases of the femora, yellow, ovipositor of 

 female also yellow. Antennae of male reaching slightly beyond base of wings, the 

 third joint as broad as long, the eighth and following joints somewhat longer than 

 broad. Thorax densely gray pruinose, not vittate, its hairs and those of the abdomen 

 yellowish; hypopygium rather small, the claspers terminate in a curved hook. 



