CYRTIDAE — HIRMONEURIDAE. 21 



Fam. XVI. CYRTIDAE. 



Charact. — Thorax and abdomen inflated. Eyes occupying the greatest 

 part of the head. Tegulae vaulted, exceedingly large. Wings 

 naked, with variable neuration, sometimes very intricate, some- 

 times very incomplete ; the basal cells, when present, are of consi- 

 derable length. Terminal joint of the antennae simple. Tibiae 

 without spurs ; empodium much developed, pulvilliform. 



This family is divided into the two sections of Cyrtina and 

 Oncodina. In the former section the veins of the wings are strong 

 and well developed, and the neuration is usually rather complicated. 

 It contains the genera: Cyrtus Latr., Pteropexus Macq., Epi- 

 cerina Macq., Panops Lam. (= Mesophysa Macq.), Lasia Wied., 

 Eulonchus Gerst., Psilodera Griff. (— - Mesocera Macq.), Ptero- 



DONTIA Griff., ASTOMELLA L. Dllf., PHYLLIS EricllS., OCN^A 



Erichs. (= Eriosoma Macq. = Exelasis Walk.), Pialea Erichs., 

 Obsebius Cost. (= Pithogaster Loew), Physegaster Macq. 



The section Oncodina is distinguished by the anterior veins of 

 the wings alone being completely developed, whereas the posterior 

 ones are not only very incomplete, but also disappear gradually, 

 and frequently are not completely connected. The genera which 

 belong here are: Oncodes Latr. (= Henops Meig.), Terphis 

 Erichs. and Philopota Wied. 



The N. A. species known to me belong to the genera: I. Cyr- 

 tina: 1. Cyrtus Latr., 2. Ocn^ea Erichs., 3. Pterodontia Griff., 

 4. Acrocera Meig., 5. a genus hitherto unnamed, and related to 

 Obsebius, 6. Eulonchus Gerst., occurring in California. II. On- 

 codina: 7. Oncodes Latr. 



Fam. XVII. HIRMONEURIDAE. 



Charact. — Three basal cells much prolonged ; veins of the wings varying ; 

 third longitudinal vein furcate; the two intercalary veins present. 

 Third joint of the antennae simple ; terminal bristle simple or simi- 

 lar to a style, and consisting of several joints. Tibiae without ter- 

 minal spurs ; empodium pulvilliform, but more frequently minute 

 as well as the pulvilli. 



This family, usually called Nemestrinidce, must be divided into 

 the two sections Hirmoneurtna and Rhynchocephalina. The 

 first comprises the genera: Hirmoneura Meig., Exeretoneura 



