Vol. xxii] ENTOMOLOGICAL NEWS. 457 



On page 410 a hypothesis as to the usefulness of this long 

 imaginal abdomen has been suggested. 



Efforts to secure a pairing between $ 55 and 9 59 were un- 

 successful. 



THE; SPECIFIC IDENTITY OF THIS MECISTOGASTER. 



In the Biologia Centrali- Americana (Calvert 1907, p. 354) 

 I was doubtful as to whether Costa Rican examples of M. mo- 

 dcstus should be referred to the race iphigenia Selys or not. In 

 describing iphigenia (from Bogota and Panama) de Selys 

 wrote (1886, p. 22) : "La seule difference a noter en com- 

 parant ces exemplaires au type [de modest us] du Mexique, 

 c'est que dans les deux sexes, la raie humerale interne est 

 reduite a une virgule basale tres courte," and on the following 

 page he states, " 3 Le bout des quatre ailes blanc laiteux." 



The material now before me is more extensive, so far as 

 Costa Rica is concerned, than that available when the Biologia 

 was written and consists of the following images : 



Costa Rica, Juan Vinas (2 $ No. 55 and April 28, 1910, and 

 3 9 $ Nos. 57, 59, and May i ; also the $ by Bruner quoted in 

 Biol Cent. Amer.), Orosi (i 9 by Sr. Picado) and Tuis (i 

 pair in coitu and i 9 June, 1907, by Mr. C. H. Lankester, for- 

 warded by the late Prof. Biolley and now in the Acad. Nat. 

 Sci., Phila.) 



Guatemala, Purula (3 $ 3 9 ) and Cubilquitz (i 9 ) cited in 

 Biol. Cent. Amer. 



Mexico, Presidio in Vera Cruz (2 $ 29) and Atoyac (i 9 ) 

 cited in B. C. A., Cordoba (fragments of two individuals reared 

 by Mr. F. Knab). 



The pair from Tuis and the Juan Vinas male of April 28 

 have fully colored thoraces and on comparing them with the 

 equally well colored examples from Presidio and Atoyac, the 

 internal humeral ray is no shorter in the former than in the lat- 

 ter. The Juan Vinas female by Bruner has this ray of the 

 same length as the other Costa Rican specimens. 



As stated in the Biologia volume, page 57, one female from 

 Presidio has the tips of the wings milky, as described by de 

 Selys for iphigenia; this female has the pterostigma creamy- 



