4 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



8. Teeth ou hind femur beneath less than twenty, distinct, never minute and 

 comb-like ; abdomen elliptical or obovate in side view, compressed apically ; 

 second and sixth tergites largest; femoral teeth variable in size and 

 number; pronotum with or without carinae in front of its hind margin; 

 antennae 12-segnieuted ; labial palpi 3-segmented, maxillary palpi 4-seg- 



mented. Distribution general Leucospis Fabrlcius. 



Teeth on hind femur beneath more than twenty, very minute and comb- 

 like; abdomen pear-shaped, nearly globular apically; sixth tergite large 

 Epexoclaenoides Girault. 



Genus MARRES Walker. 



Genotype. — Marres dicomias Walker. 



This genus, established in 1841 by Walker,^ contains but a single 

 species, which is kno^vn to the writer only from literature. 



Genus POLISTOMORPHA Westwood. 



Genotype. — Polistoniorplw. surinamensis Westwood. 



Polistomorpha was founded in 1839 by Westwood as a subgenus 

 of J^eucospis, based on the single species surinamensis. In 1860 

 >Valker made it a separate genus when he described spegoides. Be- 

 sides these two, the following species have since been described, 

 fasciata Westwood (1874) and nitidiventris Ducke (1906). A key 

 to these four species is given by Ducke.^ Cameron (1904) added 

 nigromaculata^ and another species is here transferred to this genus 

 provisionally. 



POLISTOMORPHA (?) BULBIVENTRIS (Cresson). 



Leucospis hulbwcntris Ckesson, Trans. Amer. Ent. Soc, vol. 4, 1872, p. 29. 

 The type in the Philadelphia Academy of Science is a male (Cat. 

 No. 1776), which makes it difficult to assign definitely the species to 

 this genus, as the writer has never seen any of the above species and 

 males are known of only two. There is a faint carina in the yellow 

 band on pronotum, hind margin of scutellum is slightly angled, 

 propodeum twice as long as metanotum and with a median carina, 

 hind femur with a large basal and about twelve small teeth. As 

 the basal three-eighths of abdomen (segments two and three) is con- 

 stricted into a petiole which is less than half the width of the bulbous 

 distal part, the species is provisionally transferred to Polistomorpha 

 in spite of the lack of a spur on hind coxa. 



Genus LEUCOSPIS Fabricius. 



Leucospis Fabkicius, Syst. Ent., vol. 1, 1775, p. 361. 



Genotype. — Leucospis dorsigera Fabricius. 

 Exochlaenus Shipp, Ent. Mo. Mag., vol. 30, 1894, p. 245. 



Genotype. — Exoclaenus anthidioides (Westwood). 



» Entomologist, p. 217. 



» Bull. Soc. ent. Fiance, 1906, p. 163. 



