126 



of the third segment. Face and occiput silvery pruinose. Mystax silvery 

 white. Hairs of palpi pale golden. Thorax shining black except humeral 

 calli and lateral apices (parascutella) of mesothorax which are reddish yellow. 

 Short silver pile on coxae and a pruinose strip of same color extending from 

 base of wing to pro-coxa. Another branch of this strip just anterior to the 

 mesopleural suture. Pruinose area of same color on post-scutellum and 

 hypopleurae. Coxae, legs, pale yellow. Hind femur brownish above and at 

 apex. Middle portion of hind tibiae brown. Hind basitarsus as long as 

 next three joints together. Wings hyaline with iridescent reflections. Veins 

 yellow basally, brown distally. Halteres yellow. Abdomen slender, fifth 

 segment laterally dilated. First tergite, black; second, black with a median 

 yellow area widening at lateral margins; third, yellow anteriorly, black poste- 

 riorly; fourth, black with lateral and posterior margins yellow; fifth, black 

 with anterior, posterior and lateral (very narrowly) margins yellow; sixth and 

 seventh, black with very slight amount of yellow on margins; eighth, yellow. 

 Venter black. 



A unique Dioctria in material loaned (through the kindness of 

 Dr. J. Chester Bradley) . The holotype was taken at Tallahassee, 

 Florida, May 2, 1915 (C. S. Spooner) and is in the collection at 

 Cornell University. 



Cyrtopogon tenuis, new species. 



cf, 9 . — Length 8 and 9 mm. respectively. Black. Antennae black with 

 black hairs; style one-fifth length of antenna, with short spine at tip. Hairs 

 of vertex and occiput black, of post-genae, white. Mystax thin; black below, 

 yellowish-brown pollinose. Thoracic dorsum black with black hairs, brownish 

 and white pruinose, pattern more obscure than in Cyrtopogon lyratus. Scutel- 

 lum convex, black with black hairs. Coxae and legs black except tarsi and 

 proximal one-third to three-fourths of tibiae which are dark chestnut. Wings 

 hyaline, slightly smoky toward apex. Cross-veins faintly clouded with gray. 

 Halteres yellow. Abdomen shining black with light hairs anteriorly, black 

 hairs posteriorly. Lateral posterior angles of tergites 2-5, white pruinose. 

 In male, a faint brown-pruinose patch on each posterior median of tergites 

 2-5, giving appearance of indistinct bands. 



Two specimens, Southwest Harbor, Maine, July 20, 1923 

 (C. W. Johnson). The holotype (cf) and allotype (9) are in 

 the collection of the Boston Society of Natural History. In the 

 keys it runs to Cyrtopogon lyratus O. S., but differs from that 

 species in having the thoracic markings duller and more obscure, 

 the anterior three-fourths of the tibiae chestnut, the sides of the 

 first abdominal tergite with weak, scattered pile and no silver 

 pruinosity, such as occurs in lyratus, the mystax with white hairs 

 intermingled with the black, and the cloudings of the wings gray 

 rather than brown. It is also appreciably smaller, more slender 

 and with shorter pile. 



Laphria altitudinimi, new species. 



cf, 9 . — Length 16-24 mm. Black with pile on thoracic dorsum pale 

 yellow, and on abdomen, reddish yellow. Antennae black with black hairs. 

 Proboscis and palpi black. Mystax, beard, and occipital hairs black. A few 

 golden hairs on face and base of palpi. In some the beard is yellow, and in 

 one specimen the yellow hairs extend into the mystax. A pair of golden 

 bristles on ocellar tubercle (in twenty specimens of Laphria sericea examined, 

 these bristles were black). Patch of long, pale-yellow pile on pleurotergite. 

 Legs black with black hairs; a few light-colored hairs on pro-coxae. One 

 individual has pale hairs on front femur and tibia, with a few hairs of same 



