10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.70 



Genus BACCHA Fabricius 



Pelbcinobaccha, new subgenus 



Subgenotype. — Baccha {Pelecinohaccha) 'peruviana^ new species. 



Belongs to the genus Baccha but may be readily separated by the 

 extraordinary elongate and slender abdomen of the female, which is 

 cylindrical and nearly twice the length of the wing (17.5:10.5) and 

 consists of six visible segments, all of equal length (except the first) . 

 The last segment, however, must be part of the usually retracted and 

 very small first joint of the ovipositor. Differs from the preceding 

 segments in being composed of a single band of chitin without any 

 sternal sclerite, or even a suture on the ventral side. Post angular 

 section of cross vein is shorter than posterior cross vein; alula well 

 developed. 



The male shows no unusual type of abdominal modification. 



BACCHA (PELECINOBACCHA) PERUVIANA, new species 



Fairly large, blackish to brownish species, the wings infuscated 

 except on outer third. 



Male. — Head large; ocelli well advanced of hind occipital margin; 

 frontal triangle large, blackish with dark pile ; frontal lunule large, 

 semicircular; face fairly broad, narrowing gradually downward; 

 sides of face yellowish ; remainder brownish ; tubercle well developed ; 

 lower margin of eye separated from oral margin by less than one- 

 half of the width of third antennal joint; thorax brownish, humeri, 

 post alar calli and scutellum faintly tinged with yellow ; legs brown- 

 ish (hind legs lacking) ; abdomen elongate, gradually tapered; seg- 

 ments two, three, and four of equal length. 



Female. — Front narrow at vertex, the width less than length of 

 arista; ocelli remote from hind occipital margin; front above an- 

 tennae broad as in male; hind legs blackish, the basal three-fourths 

 of hind tarsi black, remainder of tarsus pale yellow; wings infus- 

 cated, nearly hyaline on posterior border and apical fourth of wing. 



Length of male 14.5 mm. ; of female 24.5 mm. ; wing 10.5 mm. 



Type locality. — Chauchamayo, Peru (W. F. H: Rosenberg). 



ry^e.— Cat. No. 28761, U.S.N.M. 



Female type, male allotype, one female paratype. 



This species bears a superficial resemblance to Pelecinus polyturata 

 (Hymenoptera) in which the female has a remarkably long and 

 slender abdomen and the male has a clubbed abdomen. 



BACCHA (BACCHA) MICROPELECINA. new species 



Female. — Resembles Baccha {Pelecinobaccha) peruviana in having 

 an elongate abdomen, nearly twice the length of the wing (9:5), but 

 the fifth and sixth segments, while well developed, are much shorter 



