AMERICAN UIPTERA. 219 



destitute of long bristles or pile. Knob of balteres yellow. Veins brown ; sec- 

 ond basal longer than first by three times the cross-vein at the end of the first. 

 2 mm. 



Southern California ; Texas (Brues). 



Platypalpiis tersus Coquillett. 

 Proc. Nat. Mus. 1896, p. 439. 



Yellow, except eyes and arista black. Third antennal joint short, oval. 

 Front femora twice as thick as the hind ones, middle femora one-half thicker 

 than the front ones. Third and fourth veins parallel, second basal longer than 

 the first; sixth vein obsolete on basal fourth. Length 2-3 mm. 



Georgia and North Carolina (Coquillett) ; Georgia and Loui.'iiana 

 (Pilate). 



Platypalpus impexus sp. nov. 



Related to tersus Coq. and to Icetus Loevv. The following are its 

 distinctive characters : 



Head black, yellow-poUinose. Thorax not shining, closely covered with yel- 

 lowish tomentum. Proboscis yellow, infuscated apically. Pleurse closely yellow 

 tomentose ; the usual clear space is rather small. Front and middle femora sub- 

 equal, twice as thick as hind femora, middle femora with much reduced spines 

 and with yellowish hairs. Spurs of middle tibiae smaller than in the allied 

 forms; apex of each tarsal joint narrowly but distinctly black. The fourth vein 

 is slightly sinuous and bends back at the tip, so it there diverges slightly from the 

 third. 



One female; Brookings, South Dakota. One female; Battle 

 Creek, Michigan. 



Platypalpii»« Isetus Loew. 

 Cent. V, 81. 



Yellow, shining, head cinereous; proboscis black; third joint of antennse and 

 tarsi piceous; spur of middle tibise rather large. Wings yellowish, veins yellow, 

 third vein straight, fourth vein lightly curved towards third ; first basal cell a 

 little shorter than the second. Length 2.2 mm. 



New Hampshire (Osten Sacken). 



Platyaplpiis flavirostris Loew. 

 Cent, v, 80. 



Yellow, reddish above, shining, head cinereous, proboscis yellow, last joint of 

 the antennae black, last joint of the tarsi fuscous, except at base; apical spur of 

 middle tibue small. Veins pale yellow, thii'd vein very slightly curved towards 

 the fourth ; basal cells equal, sixth vein not obsolete at base. Length 2.6 mm. 



New Hampshire (Osten Sacken). 



Plalypalpiis iiiesograinniiis Loew. 

 Cent, iii, 38. 



Yellow, shining. Antennae, palpi and proboscis, except tip, yellow. Head 

 black. A median thoracic vitta rufescent. Scutellum, except lateral angles and 



TRANS. AM. ENT. SOC, XXVIII. JULY, 1902 



