80 MADEIRAN COLEOPTERA. 
218. Psammodius porcicollis. 
P. globoso-ovatus fusco-piceus, prothorace transversim quatuor-sul- 
cato, sulcis profunde punctatis, ad latera et postice ciliato, elytris 
profunde crenato-striatis, antennis diluto-testaceis, pedibus rufo- 
piceis, tibiis omnibus dentatis, 
Mas (?) tibiis anticis minus fortiter dentatis. 
Long. corp. lin, 12-2. 
Aphodius porcicollis, Iihg., Mag. fiir Ins. ii. 195 (1803), 
—— ——, Suckow, Nat. 258 (1830). 
Psammodius porcicollis, Muls., Lamell. de France, 322 (1842). 
—— ——, Lucas, Col. de l Algérie, 267 (1849). 
P. globose-ovate and very convex (especially the elytra), brownish- 
piceous, and but slightly shining: with the clypeus (which is a 
little emarginated at its apex) very rugosely granulated anteriorly, 
and more or less distinctly sulcated behind, Prothorax with four 
deep transverse grooves, which however are somewhat interrupted 
along the dorsal line,—especially the hinder ones, which are sepa- 
rated by a short longitudinal channel; the grooves very deeply 
punctured (the punctures being exceedingly large and distinct) ; 
ciliated along its hinder and lateral margins. lytra ventricose, 
and deeply crenate-striated. Antenne diluted-testaceous. Legs 
bright rufo-piceous, and with all the tibiw dentated externally,— 
the anterior ones, however, in the male (?) sex being less powerfully 
toothed than in the female; tarsi with the basal joint of the four 
hinder ones somewhat long, and rather largely developed. 
The present Psammodius was detected by myself on the sand-hills 
behind the southern beach of Porto Santo, during April and May of 
1855; where I took it in tolerable abundance (at a considerable 
depth beneath the surface), especially at the roots of the Arundo 
donax. It is found in Mediterranean latitudes (being recorded in 
the south of France and in Algeria), particularly in maritime districts ; 
but it becomes rarer towards the north, and as we recede from the 
coast: M. Mulsant nevertheless states that it occurs sparingly near 
Lyons. I possess a series from Marseilles, with which the Porto- 
Santan specimens agree in every respect, except that their protho- 
racic sulci are somewhat more interrupted along the dorsal region. 
Fam. 22. TROGIDA. 
Genus 88. TROX. 
Fabricius, Ent. Syst. 1. 86 (1792). 
