MCNEILL REVISION OF THE TRUXALIN.« OF NORTH AMERICA. 1 95 



^A(^alke^, Francis. — Catalogue of Specimens of Dermaptera Saltatoria 

 in the ColIcctio)i of the British Museum. London. 8vo. Part 

 III. 325-604. 1870. Part IV. 605-609. 1870. Part V. 

 811-850. 187 1. Supplement to Blattariae, 1-43, 187 1. Sup- 

 plement to the Catalogue of Dermaptera Saltatoria, 1-95, 1871. 

 On the Geographical Distribution of Dermaptera, 96-116, 1871. 



KEY TO TRUXALIN.^.. 



A.' Head distinctly longer than the pronotum, eyes very oblique, 

 nearly horizontal; metasternal lobes contiguous. (Fig- 2b, 2c.) 



B.^ Tegmina very much shorter than the abdomen ; spines of the pos- 

 terior tibiie minute and numerous, about 25 



I. — Radiuotatum, n. gen. 



B 2 Tegmina exceeding the abdomen ; spines of the posterior tibias less 

 numerous, about 16 2. — Achurum, Sauss. 



A. 2 Head sometimes equaling, never exceeding, the pronotum in 

 length. 



B.' Mesosternal lobes separated by a space almost linear in its narrow- 

 est part (Fig. 3b) ; metasternal lobes approximate in both male and 

 female ... 3. — Afeniiiria, Stal. 



B.2 Mesosternal lobes separated by a space never much longer than 

 broad (Fig. 4b), generally broader than long (Fig. iib); metaster- 

 nal lobes rarely approximate in the male, very rarely in the female. 



C.^ Antennae triquetrous (Fig. 4a) or strongly depressed at the base and 

 distinctly acuminate (Fig. 5a); pronotum with the lateral lobes 

 vertical and straight and the lateral carinae not at all sinuate 

 (Fig. 5a); median carina of the pronotum generally cut much be- 

 hind the middle (Fig. 3a); the disk plain and unstriped. 



D.i Spines of the exterior margin of the posterior tibia 15 or more; 

 posterior margin of the disk of the pronotum nearly straight, 

 scarcely angled or rounded 4. — Pseudoponiala, Morse. 



D.2 Spines on the exterior margin of the posterior tibia less than 15 ; 

 posterior margin of the disk of the pronotum obtusely angled or 

 rounded. 



E.' Tegmina exceeding the abdomen considerably in both sexes (in 

 some large females but little) ; lateral carinae of the pronotum quite 

 as distinct as the median ; spurs at the apex of the posterior tibiae 

 on the inner side about equal 5. — Truxalis, Fabr. 



