SniFA.M II. V I. TKYXAI.IX.K. 



223 



head horizontal, shorter Ihan thorax; vertex without a median 

 carina, its sides distinctly raised above the level of disk ; foveohe 

 wanting or invisible from above; face but moderately oblique; 

 pronotum with lateral canine always distinct, usually curved 

 inward at middle, supplementary earime absent; tegmina often 

 abbreviated, their costal area not dilated ; winji's transparent, their 

 radial veins in apical third swollen and constricted in the males. 



Fig. 83. Structures of Tryxalhw. a. Disk of pronotum of Dichromor- 

 pha; b, same of Clinocc Chains ; c, tip of abdomen of Pscudopnmala from 

 below; d, same of Try.ralis: c, disc of pronotum of female of Mccostcthus 

 piatyptcrus; f, same of M. lincatns; g, side view of head of female of Or- 

 phulella ['didna: h, dorsal view of head and pronotum of liritcttix sini^U-.v. 

 (After .Morse and Walden.) 



KEY TO EASTKRX CEXKRA OF OSPHn.I. 



a. Pronotum with prozona not much longer than metazona, the lateral 

 lobes deeper than long; lateral carinae strongly incurved at or near 

 middle; tegmina and wings subequal to or longer than abdomen; 

 foveola? of vertex more or less evident. I. OIU-IU'LELLA. 



aa. Pronotum with prozona distinctly longer than metazona, the lateral 

 lobes longer or fully as long as deep; lateral carinse parallel or but 

 feebly incurved; tegmina normally abbreviated, shorter than ab- 

 domen; foveolse of vertex wanting. 



l>. Lateral carina of pronotum parallel throughout (Fig. 83, a.); 

 lateral lobes vertical or nearly so, flat above and meeting the 

 disk at nearly a right angle; tegmina usually much shorter 

 than abdomen in both sexes. II. DICIII!:>.MOI;I>IIA. 



W). Lateral carina? feebly but distinctly diverging on metazona 

 (Fig. 83, ft); lateral lobes slightly convex above; tegmina 

 nearly as long as abdomen in male. III. CU.NOCKIMIAI.I s. 



I. < Im-nrLKU.A (iiolio-Tos, 1S!)4, 11). Kir., Orpliula -f "little."} 



Vertex nearly horizontal, never extending in front of eyes a 

 distance 1 Drearer than its own width; lateral foveohe usually dis- 

 l'5!ct ;is narrowly triangular im|rcssed spaces on side margins of 



