NO. 1869. 7^-EW SPECIES OF WASPl^—ROHWER. 473 



dentate in the male; thorax pohshed, finely sparsely punctured or 

 impunctate; dorsal aspect of propodeum without sulci, smooth ; pos- 

 terior face of propodeum with a deep median 

 channel; posterior femora somewhat flat- 

 tened in female, more strongly so in male and 

 beneath apicaily vdih a broad, flattened pro- 

 jection, more evident in some species; pos- 

 terior tibiae strongly thickened apicaily, the 

 longer calcarivmi strongly curved; posterior 

 trochanter of male not dentate ; first ventral 

 segment (second of some authors) in the male 

 with a large hook; pygidium fringed with 

 long, fine hairs. 



This group has long gone under the name 

 alhitarse Fabricius, but inasmuch as the t^^pe 

 of Fabricius's species may still be in existence 

 and his brief description would apply equally fig. ii.— antennae of tkt- 

 well with all the species discussed below, it 1^^"'^^^''''''^''^ ''°'" 

 has been deemed advisable to treat albitarse 



as an undetermined species. Fabricius says the posterior tarsi are 

 white. In all Neotropical species discussed here the apical joint of 

 the posterior tarsi is blackish. 



TRYPOXYLON ALBITARSE Fabricius. 



Trypoocylon albitarse Fabricius, Syst. Piez., 1804, p. 180, No. 1. 



''T. atrum t arsis posticis, niveis. 



"Habitat in America meridionali Dom. Smidt. Mus. Dom. Lund. 



"Reliquis majus. Caput, thorax, abdomen, alse atra, nitida, immac- 

 ulata. 



"Pedes nigri tarsis posticis niveis." (Original description.) 



What alhitarse Saussure, Taschenberg, Cameron, is no one can say; 

 but the name mexicanum (Saussure) described as a variety of alhitarse 

 is used for one of the species here treated. 



Trypoxijlon imlliditarse Saussure (described from Argentina and 

 Brazil) is another species which can not be determined with certainty. 

 It undoubtedly belongs to this group and may be one of the species 

 here treated. 



Trypoxylon fuseipenne Fabricius is another species which can not 

 be satisfactorily determined. It was also described from Brazil. 



TRYPOXYLON POLITUM Say. 



Trypoxylon politus Say, Bost. Jonrn. Nat. Hist., vol. 1, pt. 4, 1837, p. 373, No. 1. — 

 LeConte, Writ. Th. Say Entom., vol. 2, 1859, p. 756, No. 1.— Packard, 

 Proc. Ent. Soc. Phila., vol. 6, 1867, p 413. 



Trypoxylon albitarse Walsh and Riley, Amer. Ent., vol. 1, 1869, p. 133, fig. 107. — 

 Fox, Trans. Amer. Ent. Soc, vol. 28, 1891, pp. 136 and 138, No. 1.— Fox, 



