DOLICHOPUS. 21 



although no mention is made of the peculiar course of the fourth 

 longitudinal vein, which characterizes this genus. 



6-9. censors, contingens, hebes, ineptus, all four described by 

 Walker in the Dipt. Saund. from female specimens. The descrip- 

 tions are so wretched that the identification is impossible. 



10. maculipes Walk. Dipt. Saund. The spots on the tibiae, mentioned 



by Walker, seem to indicate that this is a Pelastoneurus. But the 

 peculiar course of the fourth longitudinal vein, the chief character 

 of the genus, is again not mentioned. 



11. pulcher Walk. Dipt. Saund. I take this to be a true Dolichopus, 



although the datum of the fourth longitudinal vein beyond its 

 flexure not converging, but being parallel to the third, seems t in- 

 dicate a Gymnopternus. It belongs to the species with black femora, 

 but among the species of this description which I possess from 

 North America, there is none to which Mr. Walker's description of 

 the fourth longitudinal vein is applicable. 



12. varius Walk. Dipt. Saund. A very distinct species on account of 



its spotted wings and which will be easily recognizable even if, as 

 it seems probable, it does not belong to the genus Dolichopus. 



13. affinis Walk. This and the following species have been described by 



Mr. Walker in the List of Diptera, etc. All belong very probably 

 to the genus Dolichopus, and to the subdivision with yellow feet, 

 except the cases which I have expressly mentioned below. It is 

 not said whether the tegulae of D. affinis are ciliated with black or 

 pale hairs. If the latter is the case, and if, as it appears from Mr. 

 Walker's data, the hind tarsi are altogether black, my D. splendidus 

 might alone be taken in consideration ; but it is hardly possible that 

 it should be this species, as Mr. Walker's description of the color- 

 ing does not apply to it, and as the hind femora of the of D. 

 affinis Walk, are ciliated with only a few hairs, whereas in D. 

 splendidus these hairs are very numerous. If D. affinis has black 

 cilia on the tegulse, then D. discifer and lolatus could be thought 

 of, but the hind femora of their males are entirely destitute of 

 bristles, so> that the description of D. affinis cannot be applied to 

 either of them. 



14. lamellipes Walk. It has the inferior orbit ciliated with black. 



Among the North American species of Dolichopus with pale-colored 

 feet D. pachycnemus and D. brevipennis alone partake of this cha- 

 racter. The other data of Mr. Walker do not apply at all to these 

 species, as neither of them has a white face, the first antennal joint 

 red and the third joint very long. 



15. ciliatus Walk. Very poorly characterized. I suppose that the cilia 



of the inferior orbit are pale. If the tegulse are likewise ciliated 

 with pale hairs, then D. variabilis and D. luteipennis might be taken 

 in consideration. But D. variabilis has no golden-yellow face, its 

 fore tarsi are not "dark tawny," but always black from the tip of 



