94 AMERICAN HYMENOPTERA. 



of the posterior wing separates it at once. The wings — in 



0. femigineus at least — are comparatively shorter, and their 

 ends more rounded than in any other member of the tribe 

 which I have seen. The members of the genus are not well 

 known, and I can find but one reference to them since the 

 original descriptions. 



Distribution. — This is a strictly American genus with only 

 a few species which range from Texas to Brazil. The generic 

 type — coarctatus — came from Brazil, but all the other species 

 taken have been reported from Texas and Mexico only. 

 Records and specimens of the various species are so few that 

 no idea of the exact range of any of them can be given. 



Nothing has been recorded of the life history, habits or 

 hosts of any member of this genus. 



Variation. — One specimen of O. ferrugineus Cress, in the 

 U. S. National Museum shows a slight variation or abnor- 

 mality in venation ; in both anterior wings there is a short 

 stub of a vein — \ mm. long — extending into the fourth submar- 

 ginal cell, about 1 mm. from the outer end of the radial vein. 



Table of Species. 



1. Body ferruginous ferrugineus Cress. 



Body black 2. 



2. Wings fuscous niger Cam. 



Wings hyaline 3. 



3. Antennae short, not longer than the head and thorax ; wings long ; 



abdomen black fuscipes Cam. 



Antennae not short, reaching to the middle of the abdomen 4. 



4. Wings short, not half the length of the abdomen; basal half of 



abdomen yellow stratifrons Cam. 



Wings not short, abdomen entirely black coarctatus Br. 



Opliiopterus ferrugineus Cress. 

 Plate III, figs. 17, 18. 

 Ophiopterus ferrugineus Cresson, Proc. Acad. Nat. Sci. Phila., 



p. 380, 9, Mexico 1873. 



" " Cameron, Biol. Centr. Amer., Hym., Vol. 



I, p. 296, listed Orizaba, Mex 1886. 



1 Nototrachys annulicornis Ashmead, Proc. U. S. Nat. Mus., Vol. 



XII, p. 422, cf , Texas 1890. 



Dalla Torre, Cat. Hym., Ill, p. 178, 

 listed 1901. 



