270 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 109 



69. Poststigmatic pale spots in cell Rs usually fused and extending nearly 



to vein Mi, the posterior portion at same level with or extending 

 slightly distad of the anterior part; macrotrichia present on extreme 



apex of wing 70 



Poststigmatic pale spots in cell R5 usually small and distinctly sepa- 

 rated, the posterior one located di.stinctly proximad of the anterior 

 spot; macrotrichia present on distal third of wing; one spermatheca 

 present; male genitalia with well-developed ventral lobe on paramere. 



fieldi, new species (p. 427) 



70. One spermatheca present; legs darker; male genitalia with stem of 



paramere gradually curved at base, swollen near apex of straight 

 portion and abruptly narrowed to filiform tip. 



glabellus Wirth and Blanton (p. 429) 



Two spermathecae present; legs paler; male genitalia with stem of 



paramere abruptly bent and swollen near base, gradually tapered to 



fine tip gabaldoni Ortiz (p. 431) 



71 (68). Large species (wing 1.45 mm. long), with narrow convex mesonotum 

 with prominent yellowish and brown patches; antennal ratio 1.07, 

 sensoria present on segments in, vii-x. 



volcanensis, new species (part) (p. 389) 



Smaller species (wing 0.72-1.02 mm. long) with broader mesonotum; 



antennal ratio 0.79-0.89 or 1.85 72 



72. Second radial cell unusually broad; pale spot at end of costa well sepa- 



rated from spot behind second radial cell, farther from it than from 

 the distal pale spot in cell Rs which is narrow and transverse; pale 

 distal spot in anal cell elongated, extending caudad nearly to wing 

 margin; eye bare; antennal sensoria on segments in, vii-x; larger 



species (wing 1.02 mm. long) glabrior Macfie (p. 452) 



Second radial cell not unusually broad; antennal sensoria present on 

 segments in, viii-x or on in, x-xiv 73 



73. One spermatheca present; antennal ratio 1.85, last five segments 



greatly elongated, sensoria present on segments in, x-xiv; mesono- 

 tum brownish without definite pattern. 



patulipalpis, new species (p. 421) 



Two spermathecae present; antennal ratio about 0.8, last five segments 



not much longer than preceding series, sensoria present on segments 



III, vin-x; mesonotum blackish with prominent pattern 74 



74. Wing with macrotrichia extending in two rows to base of cell M; 



poststigmatic pale spots in cell R5 lying closer together with the 

 posterior one located slightly proximad of the other; third palpal 

 segment long and slender, about 2.2 times as long as broad, with a 



small, deep pit debilipalpis Lutz (p. 442) 



Wing with macrotrichia confined to distal half; poststigmatic pale 

 spots in cell R5 usually well separated and situated at same level; 

 third palpal segment short and swollen, 1.6 times as long as broad . 75 



75. Pale spot present in front of mediocubital fork; third palpal segment 



with a deep round pit 76 



Pale spot absent in front of mediocubital fork; third palpal segment 

 without pit, the sensoria scattered on surface . imitator Ortiz (p. 438) 



76. Eyes separated by a wedge-shaped space; antennal ratio 0.79; third 



palpal segment 1.6 times as long as broad; 14 mandibular teeth; male 

 aedeagus with three subequal distal lobes, ninth tergum with large 

 apicolateral processes hoiTmani Fox (p. 436) 



