160 PROCEEDINGS OF THE NATIONAL MUSEUM vol.75 



The wings of this species are somewhat infumated, the infumation 

 being more evident on the middle of the wing than elsewhere, more 

 evident on the female than on the male, and more conspicuous on 

 some individuals than on others. The anterior metatarsus is pro- 

 vided with six spines. The variation in the maculations, as shown 

 by the specimens before me, is not great. On two of the male para- 

 types the fascia on the first tergite also incloses a pair of discal spots, 

 and on a female paratype the fasciae on both fourth and fifth ter- 

 gites are interrupted. On all other female paratypes all fasciae on 

 the tergites are continuous. 



Cresson described two speciCvS in this genus from specimens ob- 

 tained from Cuba, a/rgentifrons and armata. I have seen the speci- 

 mens on which these two species are based and I am of the opinion 

 that argentifrons is only a form of iiionodonta Say. The male that 

 Cresson referred to his armata represents, in my judgment, a distinct 

 species, but whether this male and the female with which he asso- 

 ciated it are sexes of the same species is open to question. The 

 female (which Cresson made the type of armata) does not have the 

 golden pubescence on the frons that is so conspicuous on the male of 

 Ofpuxata^ but it does have the mixed silvery and golden pubescence 

 such as is found on the frons of the species I have just described. 

 Furthermore, I have before me a single female from Cuba that does 

 have the golden pubescence on the frons in all respects similar to that 

 of the male of Cresson's armata. If further investigation shall show 

 that the female of armata Cresson and the female of the species above 

 described belong to the same species, laj species will fall as a synonym 

 imder armata Cresson and a new species will have to be described, 

 based upon the male of Cresson's armata. In this connection I wish 

 to state that there is one thing of which I am certain : that is that 

 the male of tricosa is distinct from the malesj that Cresson referred 

 to avTriata and argentifrons. 



Length 12 mm. Described from five males and six females, in- 

 cluding the type and allotype, all from Jamaica. 



Type.— Cat. No. 40852, U.S.N.M. 



MICROBEMBEX AURATA Parker 



Figure 64 



Microhenibew aurata PARKia;, Proc. U. S. Nat. Mus., vol. 52, 1917, p. 121. 



This species differs from nionodonta in its slightly larger size, in 

 its more extensive and richer yellow maculations, and particularly 

 in the character of the genital stipites of the male. Only three speci- 

 mens are found in the United States National Museum : the type. 



