184 MODERN SYSTEM. 



Sp. 1. Onth. striatus. Payk., Monogr. Hist. 100. t. 11. /. 1, 

 Inhabits dung. 



Stirps 2. — Boch/ depressed: tlbicB hroad: tarsi short: sto7?7/m dilated, 

 the fore part forming a cavity for the head, which is capable of be- 

 ing retracted even to the mandibles. 



A. Tih'uc, tliefour posterior with two series of spines. 

 Genus 136. IlISTER of cmtJwrs. 

 Body above nearly convex : thorax with the anterior part straight. 



A. Elytra with the outer striae extending their whole length. 



a. Thorax with the sides striated, the striffi extending their 

 whole length. 



* Elytra with marginal stria. 



Sp. 1. Hist.iinicolor of authors. 

 Inhabits dung. 



** Elytra without the marginal stria. 

 S]). 2. Hist, sinuutus. lUiger. A-maculatus. Marsh. 



b. Thorax with the sides not striated. 

 * Elytra with no marginal strits. 

 Sp. 3. Hist, parvus. Marsh., Leach. 



** Elytra with a marginal stria. 

 Sp, 1. Hist.purpurascens. Fabr., Leach. Hist, bipustulatus. Martli. 

 B. Elytra Avith the external stria; abbreviated, 



Sp. 1. Hist.nitidnlus. (PI. 2. fg. 1. a. antenna magnified.) Fabr., Leach, 

 — Hist, semipunctutns. Marsh. 



B. Four posterior tibia with only one row of spines. 



Genus 137. DENDROrHILUS. Leach's Zool. Misc. vol. lii. 



Body with the upper part nearly convex : thorax short, the anterior })art 



straight. 

 Sp. 1 . Den. punctatus. 

 Hister punctatus. Ent. Heft. 



Genus 138. PLATYSOMA. Leach. 

 Body with the upper part plain : thorax transverse or nearly equall 

 quadrate. 



* Elytra without stria. Body finely punctured. 

 Sp. 1. Flat, picipes. Leach. H. piscipcs. Fabr. 



** Elytra without external stria. Body not punctured^ 

 Sp. 2. Flat.faviconiis. Leach. H.flavicornis. lierbst, 



I 



