336 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 104 



— Hind margin of mesonotura with the usual pair of lateral black spots (obliqua- 

 monostigma-minuta group) 31 



31. Pteropleuron with a black spot. Apical .yellow band separated from subapical 



at anterior margin of wing, but connected to subapical band in apex of 

 first posterior cell. 4 mm. Puerto Rico cf pura Curran 



— Pteropleuron without black spot 32 



32. Wing pattern as in atimeta: a well-delimited large roundish opaque black 



spot on apical process of anal cell. Sternopleuron black except for a 

 narrow yellow upper margin bordered by a narrow black vitta along 

 suture. One black spot above hind coxa and a double one on inferior 

 portion of pleurotergites. Second basal cell yellow with a hyaline dot. 

 Second to fifth tergites each with a pair of lateral black spots, the pair 

 on fifth tergite elongated. 4.7 mm. Peru . cf kelioggi new species (p. 365) 



— Wing with the usual or with a modified pattern. Sternopleuron yellow with 



or without black spot 33 



33. Pleura with three black spots: one on sternopleuron, one above hind coxa, 



and one on pleurotergites. Wing pattern normal 34 



— Pleura with two black spots: one above hind coxa and one on inferior part 



of pleurotergites 35 



— Pleura with only one black spot, which is on inferior part of pleurotergites. 



Mesonotum with three indistinct linear structural vittae of darker color, 

 visible only from behind 36 



— Pleura without black spots 38 



34. Second basal cell almost entirely hyaline. Second to fifth abdominal tergites 



of male and second to sixth of female each with a pair of lateral black 

 spots. Ovipositor sheath as long as last three tergites together. Pos- 

 terior pair of gonopophyses much reduced and short in male epandriura. 

 3.3-3.9 mm. United States of America; Mexico? . . . c? 9 obliqua Say 



— Second basal cell yellow with a large anteromedian hyaline spot. Only three 



pairs of lateral black spots on abdominal tergites of male. Posterior 

 pair of gonapophyses as long as, but more slender than, anterior. 4 mm. 

 Brazil: Distrito Federal cf jonasi (Lutz and Lima) 



35. Wing pattern modified; subbasal band absent except for a brown apical part 



on tip of fourth longitudinal vein. Third and fourth abdominal tergites 

 of male and third to sixth tergites of female each with a pair of lateral 

 black spots; fifth tergite of male with two pairs (sometimes spotless). 

 Eyes in profile 1.6-1.7 times as high as wide. Postpedicel only 1.1-1.2 

 times as long as wide. Fifth tergite of male elongated, 2.0-2.2 times as 

 long as fourth. Ovipositor sheath slightly longer than basal width; 

 thorax only 1.9-2.0 times as long as sheath. 3.6-4.1 mm. St. Vincent 

 (island); Paraguay; Argentina . . cf 9 incompleta (Williston) (p. 362) 



— Wing pattern normal. Only fifth abdominal tergite of male (which is 1.5-1.6 



times as long as fourth) with one pair of lateral black spots; abdomen of 

 female spotless. Postpedicel longer 1.5-1.6 times as long as wide. Ovi- 

 positor sheath shorter than width at base; thorax 4.4-4.6 times as long 

 as sheath. 4.4-5.1 mm. Costa Rica; Panamd. 



cf 9 deflorata Hering (p. 350) 



36. A well-delimited small oval opaque brownish black dot at apical process of 



anal cell. Fifth abdominal tergite of male only 1.5 times as long as 

 fourth. Eyes in profile wide-oval, only 1.4 times as high as wide. Dorso- 

 central bristles inserted almost in transverse suture. Third to fifth 

 abdominal tergites each with a pair of rounded lateral black spots. 

 2.5-2.8 mm. Southern Brazil: Sao Paulo, Santa Catarina. 



cf minuta Hering (p. 370) 



I 



