600 PROCEEDiyOS OF THE yATIOXAL ilVSEVil. VOL. 44. 



KEY TO THE SPECIES OP MONGOMA. 



1. Veins Cu, and M3 distinct at the wing margin disjuncta, new species (Brazil). 



Veins Cu, and M3 not distinct at the wing margin 2. 



2. Tarsi of all the legs white niveitaTsis, new species (Greater Antilles). 



Tarsi of all the legs not white 3. 



3. Cell Rj of the wings very long, much longer than cell R5 4. 



Cell R2 of the wings short, about as long as cell R5 5. 



4. Larger species; length 7-8 mm manca Williston' (Lesser Antilles). 



Small species; length 5 mm externa, new species (Brazil). 



5. No stigmal spot; ground color of the body yellow . pallida Williston' ( Lesser Antilles) . 

 Stigmal spot distinct; ground color of the body brown. 



longifusa. new species (Panama). 



MONGOMA DISJUNCTA, new species. 



Antennre brown; bod}' and legs light brownish-yellow; veins M3 

 and Cu, distinct at the wing margin. 



Female. — Length, 11.6 mm.; -wdng, 10.2 mm; fore leg, femur 11.8 

 mm.; tibia 14; tarsus 12.6; hind leg, femur 12.4 mm; tibia 12.4; 

 tarsus 9.6. Head: rostrum and palpi brown, the terminal segment 

 s rather darker; antennae brown; front, vertex, occiput and gensB 

 brownish-yellow. 



Thorax : prothorax light brownish, its pleura darker brown. Meso- 

 notum: praescutum dull j'ellow "nath a faint bro^smish tinge ; scutum, 

 scutellum, and post-notum brownish-yellow. Pleurse uniform dull 

 yellow, -ndth no decided contrasts in coloration. Halteres bro\sTiish- 

 j^ellow, the knob, basally, slightty darker. Legs: coxte, trochantei-s, 

 femora, and tibiae dull yellow, tarsi rather lighter yellow. 



Wing: dull yellowish-hyaline, darkest at the tip; stigma oval, 

 bro-\vn; veins brown, C and Sc more yellowish. Venation: Sc very 

 long, as in the genus; Scj retracted rather far backward, so that Scj 

 is rather longer than R,. R long, cross vein r just before its tip, 

 oblique. Rs rather long, gently arcuated, about equal to R2+3, Rj 

 short, rather sinuated. R^+s fused with Mj+j, obliterating the cross 

 vein r-m, this fusion continuing for a short distance bej-ond the cross 

 vein m, when the veins separate in a synmietrical fork. M in a line 

 with M3 and Cu,; basal deflection of M,+j very long, longer than R,. 

 Cu, about equal to Cu, ; Cu, fuses with M just before the fork of M ; at 

 the lower distal angle of cell first M, the veins separate, Cu, continuing 

 in a straight line with Cuj-f-Ms, M3 arcuates cephalad to the cross 

 vein m and continues thence straight to the wdng margin. Cuj 

 strongly divergent from Cu„ forming an angle of about 75°. Cuj 

 and first A free at the tip; second anal rather long. (See fig. 22.) 



Abdomen : tergum dark bro^\^l ; sternum, segments 1-6 dull yellow, 

 7-S dark brown; genital segment dull yellow; valves of the ovipositor 

 not very elongate, dark brown, extreme tips paler, yellowish. 



