282 A. L. MELANDER. 



iug two joints united, the division or suture occupying two-thirds its length and 

 very distinct, the style short and stout. Face and front very dark metallic, shin- 

 ing, almost black. Thorax metallic green, shining, beset with long, erect, black 

 pile; pleura metallic green, shining anteriorly, black, slightly hoary posteiiorly ; 

 halteres and the fan-like bristles in front of them black. Abdomen metallic 

 green (male), or metallic blue, green at the base (female) ; male genitals black. 

 Legs black, the last pair of coxse slightly pulverulent at the base, the knees 

 slightly brownish yellow, the tarsi brown and with their first joint but slightly 

 incrassate; in the male beset with long, soft, blackish hairs, the tip of the hind 

 tibise bearing on the underside a small brush of very short, stiff bristles (which 

 produces the appearance of an incrassation), and the yellowish brown first joint 

 of the hind tarsi having on the underside a similar brush of bristles at the base, 

 followed by a distinct emargination ; in the female the middle femora on the 

 underside, the middle tibise, and the hind femora and tibise on both sides, beset 

 with fringes of long scale-like hairs, the hind tibise broadened, and with a groove 

 on the outside. Wings of the male subhyaline, with a slight yellowish tinge in 

 the subcostal cell, especially in the stigma; in the female this yellow tinge is 

 more extended and occupies the whole antero-proximal half; venation as in 

 E. diaphorina. 



Mexico. 



UMPIS Linnaeus. 



Species of three to nine mm. in length (an undescribed female of 

 uncertain provenience, probably Yucatan, measures ten mn).), often 

 nearly glabrous, sometimes covered with long hairs, of black, gray or 

 yellowish body color more or less completely concealed beneath a 

 coating of grayish pollen, often with the legs peculiarly ornamented, 

 the males with processes or swellings, the females sometimes with 

 scale-like hairs. Antennae generally longer than the head, the 

 second joint shorter than the others except very rarely, the first two 

 joints more or less cylindrical, the third compressed, lengthened, 

 with a short, bristle-like terminal style. Proboscis at least as long 

 as the head, frequently longer, stout, adapted for piercing, the 

 label la of variable length. Eyes of the male separated or contigu- 

 ous, of the female always separated. Thorax large, generally 

 vittate, the darker vittse generally in pairs ; abdomen long, in the 

 male generally narrow and with large genitalia of peculiar and 

 variable form, consisting of two paired valves and a central fila- 

 ment, in the female generally flattened at the base and pointed 

 apically, ending in two small narrow lamellae. Sometimes the male 

 venter is armed with processes near the tip and much distorted. 

 Legs generally slender, more or less hairy and bristly, more promi- 

 nently so in the male than in the female, the hind ones longest, 

 often compressed and then generally ciliate with scales or hairs 



