No. 3-] H YGROCELE UTHUS AND DOLICHOPUS. 141 



anterior ones silvery in front. Femora brownish-black, tipped with yellow. 

 Anterior and middle tibiae yellow, the anterior ones lighter. Posterior tibiae 

 and tarsi deep black, the former yellow at extreme base. Anterior and mid- 

 dle tarsi blackened from the tip of first joint. Wings oval, much narrowed 

 toward the base, hyaline, the veins dark brown. Costal swelling and inci- 

 sion at tip of fifth vein not well marked. Tegulae and halteres yellow. 

 Tegular cilia yellow, with a couple of strong black ones intermixed. 



Described from one male specimen, collected by Dr. Garry 

 deN. Hough, at New Bedford, Mass., June 8. 



From convergens it differs by the vertex being white polli- 

 nose, as well as the face. Also the hind femora are ciliated 

 with short hairs ; the hind tibiae are totally black ; t'he lamellae 

 of the hypopygium are oval, and the third and fourth veins of 

 the wing converge less strongly. 



From albiciliatus it differs by the smaller size ; longer third 

 antennal joint, and the black hind tibiae. Moreover, the cilia- 

 tion of the hind femora of the male is shorter; the lamellae 

 are not broad and rounded, and are much lighter in color. 



From xanthocneinus it can be readily distinguished by the 

 shorter ciliation of the hind femora and the black hind tibiae. 



This is a very peculiar species and superficially resembles the 

 species of the group Hygrocelcuthus, although it is otherwise 

 quite different. 



DolicJiopus pernix, sp. nov. 



Green ; face whitish ; antennae black, arista plain ; infraocular cilia white ; 

 tegular cilia black ; feet yellow, including fore coxae, tip of hind tibiae con- 

 spicuously black ; last two joints of male fore tarsi moderately enlarged, 

 black ; fourth longitudinal vein not broken. 



Male. Length 4.75 mm., of wing 4.5 mm. Green, shining. Proboscis 

 piceous, palpi yellow. Face narrow, silvery white, flavescent towards anten- 

 nae. Antennae wide, black, first joint dark brown below ; joints subequal ; 

 second and third together ovate ; third obtusely 

 pointed ; arista dorsal, sericeous, longer than an- 

 tenna, inserted at middle of third joint. Vertex 

 shining green. Postocular cilia except upper five 

 white. Thoracic dorsum green, more or less shin- f, G . ,g._ /?./-/>.- male 

 ing, towards front and sides brassy. Abdomen antenna and tip of fore 

 shining green, sparsely silvery dusted above, becom- 

 ing thickly at sides and below, cupreous towards tip. Hypopygium piceous, 

 dusted, greenish towards base, shining on inner surface. Lamellae elongate, 



