1 82 PSYCHE [Oct.-Dec. 



curved downward and the basal part of the other is soTiiewhat enlarged. Thorax black, 

 with sparse whitish pubescence most prominent on the pleurae; scutellum black ; abdomen 

 greenish white, immaculate. Legs light \eIlow ; wings hyaline, whitish. 



Length 4 mm. 



St. Augustine, Florida (F. H. Genung). ^'^ 



17. Nemotelus albirostris Macquart. 



Nemotelus albirostris Macquart, Dipt. exot. Suppl. 4, p. 3S9; Tab. 3, lig. 8. (0 



Male. Thorax black ; abdomen white. 



Rostellum a little longer and more drawn out than in N. pantherinus ; white above, 

 black beneath; prolioscis slender and elongate. P'ront linear. Antennae inserted at the 

 base of the rostellum, yellow, the end of the third joint brown. Thorax black with a green 

 reflection. Abdomen white. Femora black the tip white ; tibiae and tarsi white, llalteres 

 white. Wings hyaline. (^Translation.) 



i^ lines (3 nnn.). 

 Virginia (M. Bigot). <" 



The "linear front " probably means that the eyes are subcontiguous as in the 

 males of some of the other species. 



Profile of head, redrawn from Macquart's illu.stration, figured on plate. 



18. Nemotelus wheeleri, sp. nov. 



Male. Head comparatively flattened ; rostellum slender, long, yellowish above; anten- 

 nae fuscous, style slender ; two triangular contiguous yellow spots in the frontal triangle; 

 eves contiguous, not depressed medially, the lower facets small ; proboscis twice the length 

 of the head, slender, chitinous, reflexed, geniculate at the basal third. Thoi-ax black, sub- 

 shining beneath, with short appressed yellow scaly pubescence; humeri and a narrow lateral 

 line pale yellow; pleurae similar; halteres white. Abdomen flat, white over all. Basal 

 three fourths of the femora black merging into the white knees, remainder of legs yelloyvish. 

 Wings and veins hyaline, third vein furcate, fourth posterior arising near middle of under- 

 side of discal cell. 



Female. This sex differs from the male as follows: head conical, one half longer than 

 high, occiput flattened; the broad front minutely scabrous, with two rounded spots at the 

 margin of the eye. Abdomen black, except for a paired medial series of transversely ellipti- 

 cal yellowish spots on the posterior margin of the first four segments, the last pair connected 

 with the yellow margin circumscribing the entire abdomen ; genitalia yellow; venter black- 

 ish, margined with yellow. 



Length 4-5 mm. 



This pretty little species was secured during the first weeks of June, 1900, at 

 Galveston, Texas, being attracted to an undetermined Composite growing profusely 



