NORTH AMERICAN DIPTERA. 55 



1. — Abdomen wholly black; legs yellowish red pubescens Will. 



Tip of abdomen, legs, humeri, scutellum and antennae yellowish red. 



rufieanda n. sp. 

 Abdomen except the base, and hind femora below, yellowish red. 



Xanthippe Will. 

 Abdomen except the base, and legs wholly, yellowish red Telis 0. S. 



Liaphria gilva Linn^. 



To the synonomy of this species, given in my previous paper, the fol- 

 lowing should be added : 



Laphi-ia bilineata Walker, List, etc., iv, 1156; Williston, Trans. Amer. Ent. Soc- 

 xi, 30. 



Liaphria Tentralis n. sp. 



%, 9. — Length 12-14 mm. Black. Face rather thickly clothed with straw- 

 yellow pile and hair, on the gibbosity with some black bristles. Beard yellow. 

 Antennae black. Thorax with straw-yellow pile, the disk of the dorsum with 

 short sparse black pile. Abdomen thickly clothed with appressed yellow pile, 

 changeable in different lights, but the pile more erect on each side of the segments 

 in front and ground color hence, here more apparent ; the venter and the posterior 

 angle of each segment on the dorsum, beginning with the second or third and suc- 

 cessively becoming larger, so that the two spots approach or meet narrowly behind 

 on the last segments yellowish red. Legs black, the tibise with short black pile ; 

 bristles black. Wings tinged with brownish, except at the base. 



Two spec-imens, California (Baron). 



Is closely related to L. vivax, but will be distinguished by the color 

 of the venter and the posterior angles of the dorsal segments. 



The length of L. vivax as given in the original description is too 

 great; it should have been 18 mm. instead of 22 mm. 



liaphria ruficauda n. sp. 



9 .—Length 18 mm. Head black; face in the middle shining, on the sides 

 lightly whitish pollinose and with sparse white hair, gibbosity small, covered with 

 rigid, porrect, black bristles. Antennae red. Occiput white pollinose; pile of the 

 beard white ; occipito-orbital and mental bristles black. Thorax bluish black, 

 covered with a delicate whitish dust, leaving two slender median stripes that reach 

 to about the suture, and a large spot in front and another behind the suture, on 

 each side, shining; a spot on the humeri, and the scutellum, shining mahogany- 

 red ; dorsum bare, with sparse, slender rows of black hairs ; bristles black ; pleurae, 

 coxae and femora with sparse, long, white pile. Abdomen nearly bare, shining 

 cobalt-bluish black, sixth and seventh segments and the ovipositor shining ma- 

 hogany-red ; pile on the sides of the first three segments white. Legs wholly 

 shining red, the tibiae with similarly colored, the tarsi in part, with black bristles, 

 the tarsi with short golden pile. Wings tinged with blackish on outer part, near 

 the base hyaline. 



One specimen, San Domingo (Frazar). 



