548 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. GS. 



greatest degree of variation is shown in the form of the areola, which 

 is sometimes nearly regularly pentagonal. Paratypo a is most Uko 

 the type, being practically identical. The male paratypes Ic-o 

 exhibit less variation in color than the females, the extreme being 

 in paratype o, in which the red is almost entirely replaced by black. 

 All the male paratypes have the yellow orbits more broadly inter- 

 rupted below than the allotype. 



CREMASTUS (ZALEPTOPYGUS) ORBFrALIS (Cresson). 



Porizon orbitalis Cresson, Trans. Amer. Ent. Soc, vol. 4, 1872, p. 174. 

 (Porizon) Zalcptopygus orbitalis (Cresson) Viereck, Proc. U. S. Nat. Mus., vol. 

 41, p. 294. 



Originally described by Cresson in Porizon, this species is one of the 

 two species referred by Viereck to his genus Zaleptopygus. It is 

 represented in the United States National Museum collection by a 

 paratype female and the allotype, the latter without the abdomen, as 

 well as four other males from Texas, two of the latter from the Bel- 

 frage collection. Its most striking characters are used in the keys. 

 The specimens available display very little variation, the form of the 

 propodeal areas being most subject to variation. In the male the 

 areola is nearly or quite as long as the petiolar area, and the width of 

 these areas varies considerably. 



CREMASTUS (ZALEPTOPYGUS) OBEREAE (Viereck). 



Zaleptopygus obereae Viereck, Proc. V. S. Nat. Mus., vol. 41, 1911, p. 295. 



As indicated by Viereck this species is most closely aUied to orli- 

 talis (Cresson), but is easily distinguished by the character employed 

 in the key. It is chiefly remarkable for the slight difi'erence in re- 

 spect to eyes and oceHi between the sexes. 



SPECIES NOT TABULATED. 



PORIZON ALBIPENNIS Cresson. 



Porizon albipennis Cresson, Proc. Ent. Soc. Phila., vol. 4, 18G5, p. 287. 



The type of this species has not been seen nor is there any specimen 

 in the National Museum collection that agrees with the description. 

 It is apparently, however, a Cremastus allied by its white wmgs to vie- 

 reckii (Cockerell) and hilineatus Cushman. From both of these it 

 differs in the white apical margins of the tergites. With hilineatus it 

 agrees in the unusually long ovipositor. 



CREMASTUS ACICULATUS Davis. 



Cremastus acmilatus Davis, Trans. Amer. Ent. Soc, vol. 24, 1897, p. 364. 



Evidently, from the description, this species is closely allied to 

 plesius Cushman and rosae Cushman, but as it is described only in the 

 male on practically nothing but color characters and as it is well nigh 

 impossible to associate the sexes without biological evidence, it is im- 



