26 Z. BOUCEK 



Polistomorpha nitidiventris Ducke 

 (Text-figs 19, 20, 27, 28) 



Polistomorpha nitidiventris Ducke, 1906 : 165—166, $. LECTOTYPE 0_ (here designated), 

 Brazil: State Para, Obidos (MP, Belem) [examined]. 



Ducke did not specify how many specimens he had so I designate the orginal 

 female, kindly sent to me for examination by Mr R. Arle, as lectotype. 



P. nitidiventris is a good species but I have not seen any other specimens. It 

 has rather short, mainly paler brownish body, with sparsely punctured gaster, as 

 stressed by Ducke in the specific name. It should be readily recognizable from 

 my key, but as existence of some unknown species cannot be excluded, I give here 

 a few more characters in addition to those mentioned in the key and in Ducke's 

 original description. 



$. Blackish markings confined to vertex, occiput, pronotum and mesoscutum, scutellum being 

 immaculate dark testaceous and gaster posteriorly and hind femora externally being only 

 darker brown. Pronotum with only two bands : a weaker and narrower one at anterior margin, 

 distinctly interrupted medially, but here indicating oblique communications towards middle 

 of the second cross-band which is situated just behind middle, not interrupted medially, not 

 reaching lateral margin. Occipital carina as in P. conura. Head in facial view 1*16 times 

 as broad as high. Interantennal (and supraclypeal) area moderately convex, smooth median 

 keel nearly percurrent. Lower margin of clypeus medially hardly emarginate, nearly flat. 

 Relative measurements: height of head 80, width of frontovertex 50, scrobes 31, lower face 45, 

 its height 42, eye 49 : 35, upper orbit not distinctly emarginate; malar space 25, width of 

 mouth 30, length of scapus 22, flagellum plus pedicellus combined 102, i.e. 1-12 times the 

 breadth of head. First and second flagellar segments subequal in length, first about 1 -5 times 

 as long as broad. Antenna similar to P. conura, which shows also similar thoracic characters, 

 except for the following. Scutellum about 1*3 times as broad as long, anteriorly slightly 

 more coarsely and less densely punctured than in P. conura. Propodeum shorter, medially 

 o-6 the length of scutellum, plicae distinctly arched, median area (between them) 2-2 times as 

 broad as long medially. Fore femur 2-8 times as long as broad, mid femur distinctly swollen 

 towards base. For gaster see Text-figs 16, 28; in general, as the whole body, less densely but 

 more distinctly punctured: interspaces dorsally on first and fourth tergite about as broad as 

 punctures, laterally and partly near hind margin on first tergite and on most of fifth tergite 

 distinctly to much broader than punctures. 



<$. Unknown. 



Biology. Unknown. Ducke (1906 : 166) collected this species on blossoms of 

 Paullinia pinnata L. 



Distribution. Brazil (Para). 



Polistomorpha sphegoides Walker 

 (Text-figs 2i, 34, 35) 



Polistomorpha sphegoides Walker, i860 : 22-23, $. LECTOTYPE $ (here designated), Brazil: 

 Sao Paulo [d'Olivenca] (BMNH) [examined]. 



This is a large black species which should be easily recognizable from the key. 

 It was redescribed and figured by Westwood (1874 : 134, pi. 25, fig. 1). The only 

 similar species is P. atrata sp. n. The male is still unknown. 



