Williston.] ^-0 [Mayl!», 



hun wliolly testaceous ; each segment of the abdomen except the first 

 ■with a black posterior fascia, second and third emarginate and velutinous, 

 the following sub-shining and in the posterior margin, very narrowly 

 yellow. Feet black, extreme apex of the femora, the basal half of ante- 

 rior and posterior tibise, the middle tibiie except the apical third and the 

 first joint of the middle tarsi, pallid yellowish ; 'alse hyalinaj, vena disci 

 colore subfusco late circumfusis.' " Long. corp. 65 lin., Long. al. 

 4J lin. 



EHstalis obscurus Lw., 1. c. 67. Ked River. 



Diagnosis, translation. " $. Brassy black shining, clothed with rather 

 long dilutelylutescentcinerouspile ; front broad, above black pilose ; eyes 

 pilose, antennae reddish ferruginous, first two joints black, arista pilose, 

 face except the usual stripes yellow testaceous, white pollinose and white- 

 pilose ; scutellum brown, black near the base ; each abdominal segment 

 except the first with a posterior black fiXscia,,not emarginate and with a very 

 slender posterior yellow margin ; feet black, apex and base of all the femora, 

 the basal third of anterior and posterior tibia;, intermediate tibiae except the 

 apex, and the first two joints of all the tarsi pallid yellowish ; wings pure 

 hyaline, veins of the disc clouded with fuscous. Long. corp. 5-5^ lin., 

 long, al., 4i-4| lin. 



Eristalis latiprons Lw., 1. c. 65. Matamoras, Texas, Iowa. 



Diagnosis, translation. " cT ?• Black, moderately shining, wholly pal- 

 lidly pilose ; antennae fuscous, setae bare, luteous ; scutellum testaceous ; 

 second segment of the abdomen with two sub-triangular testaceous spots, 

 posterior margin pallid* posterior margins of the following segments pal- 

 lid, in front pallidly pollinose ; feet black, the knees, tibial except the 

 apex, and the base of the intermediate tarsi, pallid flavescent ; eyes of the 

 male contiguous, in the female by the front broadly separated. Long. corp. 

 5 j-5i lin., long. al. 4i-4^ lin. 



EristaUss atriceps Lw., 1. c. 64. White Mts., Canada. 



Diagnosis, translation. " cj^. Black, shining; head wholly concolorous, 

 antennae obscurely rufous, arista bare ; scutellum and two spots of the 

 second abdominal segment brown ; posterior margin of the second, third, 

 and fourth abdominal segments pallid yelloAV ; wings hyaline, costa ex- 

 cept the apical third fuscous-clouded. Long. corp. 4|-4-/;y lin., long al. 

 3| lin." 



Ensialis pilosus Lw., 1. c. 70. Greenland. 



Diagnosis, translation. "J^?. Black, thickly clothed with long yellow 

 pile ; eyes black pilose; antennas black, arista bare ; face black ; thorax 

 unicolorous, opaque; scutellum luteous; first two abdominal segments 

 opaque, secured on each side with a dilutely lutescent spot ; third segment 

 black, with two opaque spots, confluent in an abbreviated fascia ; two ul- 

 timate segments brassy [metallic], black, shining, with a niinute triangu- 

 lar spot, opaque ; pile of the dorsum lupinous, on the sides of the middle 



