REVISION OF LEUCOSPIDAE 27 



Biology. Host unknown. The species mimics the wasp Stelopolybia angulata 

 (Fabricius), as already noted by Ducke (1906 : 164). 

 Distribution. Brazil, Peru. 



Material examined 



Type data given in synonymy. 



Brazil: 'Amazonas', 1861, 1$ (Bates) (UM, Oxford); Obidos, iii. 1908, 1 $ 

 (Ducke) (MNHN, Paris); without data, 1$ (TM, Budapest). Peru: Cuzco, 

 Atalaya, Rio Tambo, 19.iii.1954, 1 $ (J. M. Schunke) (BMNH). 



Polistomorpha atrata sp. n. 



(Text-figs 22, 33) 



$. 14 mm. Body mainly black or brownish black with following parts testaceous (darker 

 dorsally, paler ventrally): antenna except pedicellus and following segment, vaguely bottom 

 of notaular furrows and narrowly sides of mesoscutum, tegulae, subalar area and metapleurum, 

 first tergite beneath and narrowly along hind margin, epipygium, hind coxa beneath, a line 

 anteriorly on fore femur, mid femur except dorsally, hind femur except broadly on disc, all 

 tibiae and tarsi. Wings yellowish brown. 



Head only as broad as pronotum anteriorly, dorsally about 2-5 times as broad as long, temples 

 distinct but narrow. Occipital carina complete, sharp, smooth; vertex densely punctured, 

 smooth areas laterad of each ocellus small; ocellar triangle fully 2-1 : 1, POL : OOL as 

 13 : 14. Head in facial view 1-06 times as broad as high; convex interantennal area bluntly 

 ridged in middle. Relative measurements: width of head 90, frontovertex 55, width of scrobes 

 36, lower face 52, its height 51, eye 56 : 35, inner orbit not distinctly emarginate; malar space 

 27, length of scape 25, width of mouth 38. Lower margin of clypeus bilobed, medially emargi- 

 nate and depressed. A scar instead of maxillary palpi. Scapus about 2-2 times as long as 

 broad; pedicellus oblong, slightly shorter than second flagellar segment; first flagellar segment 

 the longest, about i-6 times as long as broad, the eighth subquadrate, clava 2-3 times as long 

 as broad. 



Pronotum swollen before hind margin but without indication of a carina, from swelling 

 towards head strongly declivous; hind margin obtusely subincised medially, sides slightly 

 concave, strongly converging; surface densely finely punctured, but behind and on swelling 

 more coarsely and less densely punctured; lateral panel strongly depressed behind middle, 

 lower corner subrectangular. Mesoscutum strongly convex along median line and here slightly 

 shiny, as pronotum posteriorly moderately coarsely and much less densely punctured than 

 elsewhere; notaular furrows indicated by broad percurrent depressions. Scutellum strongly 

 convex, on disc with narrow smooth interspaces as on disc of mesoscutum, 1 '3 times as broad 

 as long, very narrow hind margin set off by crenulate groove; pilosity dense, black, but very 

 thin, not very conspicuous. Dorsellum except for separated smooth postero-lateral low corners 

 dull, densely punctured and pilose, sculptured area subtriangular, forming a raised dorsal 

 plain delimited by subvertical slopes. Propodeum medially fully twice as long as dorsellum; 

 median carina and plicae high; hind margin of median area not reaching far behind level of 

 postero-lateral corners. Pubescence of thoracic pleura, as on dorsum, much thinner than in 

 P. sphegoides; horizontal groove delimiting subalar area very deep; mesepisternum : upper 

 convex part dull, densely punctured, punctures extending down on a neck between deep femoral 

 depression and long-oval pronotal depression (this neck extensively smooth in P. sphegoides) 

 and then down to mid coxa. Mid femur broadened basally as in P. sphegoides. Hind coxa 

 with distinct transverse striation on impunctate dorsal black part. Hind femur moderately 

 stout (Text-fig. 33), basal tooth long and slender, subapical teeth on a lobe; externally surface 



