1893.] NATURAL SCIENCES OF PHILADELPHIA. 467 



THE NORTH AMERICAN LARRIDJE. 

 By WILLIAM J. FOX. 



The following paper is compiled chiefly for the sake of bringing 

 to light some of the numerous new species contained in the collection 

 of the American Entomological Society. Jn the arrangement of the 

 genera I have followed that of Kohl, with one exception : the remov- 

 ing of the genus Lyroda from among the true Larriens — as I think 

 the regularly formed ocelli are sufficient to justify such a course. The 

 term Larrkke is used simply for the want of another name, as the 

 Bembeckkie, Larrida? and Nyssonicke seem to merge into one another 

 and are not entitled to family distinction, the connecting links being- 

 formed in the genera Neolarra and Bothynodeihus, the position of the 

 latter genus being but a matter of opinion, as it seems to be as much 

 related to Alyson as it does to Dienoplus, a new genus described here- 

 in, which shows the relation of Bothynodethus with the Larridce more 

 strongly than ever. It is true that the Bembecida? offer better char- 

 acters for their distinction from the Larrkke than do the Nyssonida?; 

 however, the discovery of Neolarra, with its combined Bembecid and 

 Larrid characters, makes an almost complete merging of these three 

 supposed families. I desire to express my thanks to Mr. Wm. H. 

 Ashmead, Prof. C. V. Riley, Mr. J. A. Guignard, Mrs. Annie T. 

 Slosson.Mr. J. Aldrich, Dr. W. A. Nason and T. D. A. Cockerell, 

 all of whom have furnished specimens by means of which this article 

 was possible. Our genera may be distinguished as follows: 1 

 1 — Inner margins of eyes not emarginate; marginal cell with or with- 

 out an appendiculatiou 4 



Inner margins of eyes emaroinate; marginal cell without an ap- 

 pendiculatiou 2 



2 — Anterior wings with three cubital cells; abdomen short, sessile. ..3 

 Anterior wings with two submarginal cells; abdomen long, cla- 



vate Trypoxylon. 



3 — Female without a pygidial area; marginal cell nearly as long as 

 the three submarginal cells united; antenme of $ not dentate 

 Pison. 



1 In drawing up descriptions of the genera, I have used freely the descriptions 

 in Kohl's paper. 



