1920] 



Melander: N caret ic Tetanoceridce 331 



base and brownish distally, crossveins strongly and wing-tip weakly 

 infumated, posterior crossvein gently curved, sections of fourth vein 

 proportioned 1 : 0.9 : 1, anal vein not exceeding half the length of the 

 discal cell. 



Holotype: Mount Constitution, Orcas Island, Washing- 

 ton,* 7 August, 1909. While there are two normal fronto- 

 orbital bristles on the right side, the anterior is completely 

 lacking on the left. Were a single fronto-orbital a normal 

 occurrence, the shortened antennae and the narrow tapering 

 interfrontal stripe would be suggestive of Renocera. The 

 species is closely related to T. iinicolor Loew. 



Sepedon Latreille. 



Middle femora spinose beneath; wings brown or strongly infumated, 

 third and fourth veins apically converging; length about 8 mrn 2 



Middle femora not spinose, hind femora relatively short and stout, none 

 of the femora black-tipped; wings grayish, third and fourth veins 

 parallel; frontal spot black; third antennal joint blunt, arista mostly 

 white and half again longer than the third antennal joint; length about 

 5 mm 6 



2. Second antennal joint as thick as the bluntly triangular third; thorax, 



abdomen and legs reddish brown; frontal spot velvety brown; halteres 



yellowish; hind femora not excessively long 3 



Second antennal joint very slender and long, arista largely dark and 

 nearly twice the length of the third antennal joint; abdomen at least 

 metallic blue; all femora tipped with black, hind femora slender and 

 nearly twice as long as abdomen 4 



3. Third and fourth veins nearly parallel; central depression of front three 



times as wide as lateral depression. Me. (Hough), Mass.,* R. I., N. Y.,* 



Queb., Ont.,* N. J., Pa., Md., 111.,* Ida.,* Man fuscipennis Loew 



Third and fourth veins slightly convergent; central depression of front 

 . less than twice as wide as lateral depression. Wyo.,* Ut., Ida.,* 

 Wash.,* Cal. (Cresson, Ent. News, XXV, 457 (1914) . . .pacifica Cresson 



4. Front broadly excavated, with weak ridges; posterior crossvein bowed 



outwards. D. C, Md., Va. (Cresson, 84) tenuicornis Cresson 



Front narrowly excavated, with prominent ridges; posterior crossvein 

 straight 5 



5. Hind femora with blackish annulus beyond the middle; velvety frontal 



spot concolorous with shining portion of front; thorax reddish; third 

 antennal joint acute; halteres brownish. Jam., Porto Rico, Cuba,* 



Max., Tex. (nigriventris Wulp) macropus Walker 



Hind femora not annulate but black on apical third; frontal spot black; 

 thorax with two pronovinced blue vittae; third antennal joint with 

 rounded apex; knob of halteres black. Haiti.* caeruleus, n. sp. 



6. Underside of d^ hind femora deeply excised and bearing 2 prongs; color 



generally yellowish brown; apical segments of 9 abdomen compressed, 

 carinate above. Mass.,* Ct., N. Y., Ont.,* Md.. D. C.,* N. J., Ga., 

 Ohio, 111.,* Mich., S. D., Col., Tex.,* Mont.,* Wyom.,* Wash.,* Cal. 



armipes Loew 

 Femora of both sexes simple; color generally piceous; apical segments of 

 9 arched above. Mass.,* N. H., N. Y.,* N. J., Md., D. C, Va., Ga.. 

 Mid. States, Neb., Wyo.,* Mont.,* Ida.,* Wash.,* Cal. . .pusillus Loew 



