no.1760. THE EARWIGS OF THE U.S.* ITIOXAL MUSEUM— BURR. Mil 



Genus SARCINATRIX Rehn. 



Rehn proposed this as a subgenus in I 903 2 , page 308, for his species 

 S. anomalia. 



The following year I raised it to generic rank and included in 

 it Opisthocosmia americana Bormans and Sarcinatrix rehni Burr. 



But an examination of Rehn's type shows that the 

 (Tonus is essentially ancistrogastrine, having not only 

 a feeble, yet distinct, costal keel on the elytra, but 

 the horns of the penultimate ventral segment arc 

 merely a highly developed form of the points or lobes 

 of that plate which characterize the subfamily Ancis- 

 trogasl rinse. 



Sarcinatrix therefore remains monotypic, S. ameri- 

 cana Bormans and S. rehni Bun- being removed to a 

 new genus. 



■ i<;. :>. I" i: \ u i.t i - 



M \ i I VENTR U, SEG- 

 ME.N r i if S VRCIN \- 

 TRIX \ N ii \l \ I. I A , 



1. ANOMALIA Rehn. 



Costa Rich. Turrialba and San Carlos, one male and two females 

 (Schild and Burgdorf). Rehn's types [1903 3 , p. 308]. 



DINEX, new genus. 



Abdomen convex, feebly depressed and feebly dilated; antennae 

 with segments cylindrical, fourth longer than third; pronotum nearly 

 square; elytra and wings ample, smooth, former with no keel; tarsi 

 with first and third segments about equally long; last dorsal segment 

 transverse, ample, sloping, not narrowed; penultimate ventral seg- 

 ment transverse, more or less rounded posteriorly. 



Type of the genus— Opisthocosmia americana Bormans, 1893 [p. 8, 

 pi. 1 , figs. 22 23]. 



I form this new genus for Opisthocosmia americana Bormans and 

 Sarcinatrix rehni Burr, both Neotropical forms. Both of these 1 

 formerly included in Rehn's subgenus Sarcinatrix, which I raised to 

 generic rank. 



But, as 1 have shown in my remarks on the genus Sarcinatrix, the 

 elytra, of that genus have a keel, though indistinct, and the penulti- 

 mate ventral segment of the male has the horns which are charac- 

 teristic of the Ancistrogastrinse. 



W c must therefore exclude from it the two above-mentioned 

 species which can not fall back into Opisthocosmia, which is now a 

 purely oriental genus with a narrow pronotum. A new genus is 

 accordingly required for these two species. 



1. AMERICANA Bormans. 



Guatemala. Cacao, Trece Aguas, Alta Vera Paz, one male and two 

 females (Schwarz and Barber). Originals of Caudell [1907 2 , p. L75]. 



