1903] MELAXDER :~ NORTH AMERICAN SPECIES OF XEMOTELUS I 79 



10. Nemotelus arator, sp. nov. 



Female. Olivaceous black, shining, densely pilose with fine dusky yellow hair ; head 

 with two ti^ansverse yellow spots above the antennae; vertex rounded into the front and on 

 the occiput, facial projection conical, stout, subacute, tnoderately long, equaling the width of 

 the eye, antennae black, inserted one third the distance out from the frontal spots; proboscis 

 short, fleshy-, geniculate at the outer third, the outer part liaiiv beneath. Thorax without a 

 huineral macule, but with a pale lateral line. Abdomen concolorous with head and thorax, 

 inornate. Femora black, except the knees, hind tibiae blackened in the middle, tarsi inius- 

 cated apically. Halteres yellow, the pedicel black. Wings whitish hyaline, the anterior 

 veins testaceous, third vein unbranched, fourth posterior vein arising from base of discal 

 cell. 



Male. More pilose, with a more bluish reflection. Frontal spots small, contiguous, 

 eyes contiguous for a short distance only, where they are impressed, facial protuberance 

 much reduced, the antennae arising from its base, proboscis short. Otherwise similar to the 

 female. 



Length 4.5-5 mm. 



Described from one male and one female from a larger lot of the same species 

 collected by Dr. Wm. M. Wheeler, March 1897, in San Diego Co., California. 

 Profile of head of male and female and figure of wing illustrated on plate. 



II. Nemotelus bruesii, sp. nov. 



Female. Black, closely covered witli short appressed coarse silvery pubescence. Head 

 short rounded conical; face short, two thirds the diameter of the eye, antennae inserted near 

 the tip of the face, rather long, especially tlie first two joints, black, arista thick, bristly at 

 tip; front with two narrow transverse white spots, proboscis short, but little longer than the 

 length of the head, geniculate at its outer third, the outer part fleshy and hairy. Thorax 

 "with a small humeral spot; lateral line obsolete. Abdomen unmarked. Femora black except 

 tip, tibiae darkened at middle, especially the hind ones, remainder of legs testaceous. Hal- 

 teres blackened. Wings hyaline, the stronger veins testaceous, third vein furcate before its 

 end ; the fourth posterior vein arising at the basal third of the under side of the discal cell. 



Male differs in the fine golden pubescence; face stubby, ejes scarcely touching; frontal 

 spots triangular, subcontiguous. 



Length 4 mm. 



Described from numerous specimens collected by myself and by Mr. Charles 

 T. Brues, my constant fellow-worker, during our stay at the University of Texas, 

 Austin, Texas. This species is abundant during middle April, and shows special 

 partiality for the flowers of Lepachys co/iim'/iaris, the entire collection being made 

 from the flowers growing on the University campus. The species is soon suc- 

 ceeded in the local fauna by JV. trinotatiis. 



Profile of head of male and female and arrangement of venation figured on 

 plate. 



