MCNEILL REVISION OF THE TRUXALIN.E OF NORTH AMERICA. 22 1 



in or behind the middle. The metazone is sub-truncate or decidedly 

 angulate. The lateral lobes of the pronotum are about as high as long 

 with both the anterior and posterior margins moderately oblique, the 

 latter generally sinuate and the lower margin nearly horizontal and 

 scarcely perceptibly or very moderately angulate in the middle. Be- 

 hind the principal sulcus the lateral lobes are generally deeply and 

 thickly pitted. The mesosternal lobes are separated b\- a space not 

 (male) or a little (female) broader than long, the metasternal lobes by 

 a space longer than broad (female) or they are closed behind (male). 

 The tegmina and wings are well developed, exceeding the abdomen. 

 The former have a very different structure in the two sexes. In the 

 male they are regularly reticulate everywhere except in the anal field 

 and at the base of the scapular area which is opaiuie. This and the 

 ulnar area being widened and furnished with a single series of con- 

 spicuous veins. In the female, thev are irregularly reticulate through- 

 out and not expanded in the ulnar or scapular areas. The legs are 

 moderately or quite slender, their posterior femora much exceeding 

 the abdomen even in the female, and the posterior tibiae are furnished 

 with 17 to 20 rather small spines. The ovipositor is moderately ex- 

 erted and the last ventral segment of the male is acutely conical. 



S\r/>i//a, Stdl, 1S73. Recen. Orth., I, 90. 



Syr/m/a, Bruner, 1893. Rev. Sys. Orth., 119. 



Oxycorypliiis, Sauss., 1861. Orth. Nov. Am., II, 16. 



Irr part, Stenohothms, Thos. , 1873. Syn. Acrid. N. Am., 80. 



This distinct North American genus contains four species as now 

 determined, all of them being southern, though S. a(/m/ra/>i7/s extends 

 as far north as northern Illinois. 



Key to Svrbula. Stal. 



A.' Median carina cut by two sulci . . . . i. — Moiiieztnnay Sauss. 



A. 2 Median carina cut by the last sulcus only. 



B.» Lateral lobes of the pronotum either plainly punctate or fur- 

 nished with elongate rugte behind the principal sulcus. 



C' Lateral carina of the pronotum generally sinuate. Posterior fe- 

 mora and tibiae unusually long and slender, the latter with 19 



(female) to 2 1 (male) spines on the outer edge 



2. — Admirahilis, Uhler. 



C.2 Lateral carina; of the pronotum strongly sinuate. Posterior femora 

 and tibiae moderately slender, but not longer than usual, the latter 

 with 17 (male) spines on the outer edge. 3. — Aciiticornis, Bruner. 



[Proc. D. a. N. S., VoL VI.l 28 [December X9, 1896] 



