204 MADEIRAN COLEOPTERA. 
of depressions or fovev, will readily distinguish it from its allies 
here enumerated. This latter character indeed is (for the Trogo- 
phle) a very anomalous one; and I may add, that Mr. Janson, to 
whom I submitted the species for inspection, and who has paid con- 
siderable attention to the Owytelides, observed that it was the only 
Trogophleus with which he was acquainted that possessed this pecu- 
liarity. The 7. fuliginosus, however, has its prothoracic fovese 
almost obsolete ; and accordingly Mr. Janson makes the following 
remark, concerning the Porto-Santan simplicicollis :—*< Its nearest 
ally appears to me to be the 7. fuliginosus ; but whilst, on the one 
hand, its totally smooth (non-foveolated) thorax indicates its re- 
lationship to that species, its minute size, narrow thorax, and the 
shortness of the third jomt of its antenne (as compared with the 
second) perhaps render its location near the pusi/lus more natural.’ 
It was detected by myself, in tolerable abundance, in Porto Santo, at 
the beginning of May 1855,—burrowing into the earth which forms 
the bank of the (brackish) stream at the Zimbral d’Areia. Its 
excessively minute size, however, and dark colour, rendered it 
extremely difficult to see, and capture ; and it could only be obtained 
by watching closely, as it ascended to the surface during the hot 
sunshine, and securing it along with a portion of the soil. 
(Subfam. 7. OMALIADES.) 
Genus 234, OMALIUM. 
Gravenhorst, Col. Micropt. 116 (1802). 
576. Omalium ocellatum. 
Omalium ocellatum, Woll., Ins. Mad. 6138 (1854). 
Inhabits the Northern Dezerta, or Ilheo Chao, and is hitherto 
unique,—the single specimen as yet detected having been captured 
by myself, on that island, early in June 1850. 
577. Omalium clavicorne, n. sp. 
O. lineare alutacenm subopacum, capite nigro ocellis flavo-piceis 
instructo, prothorace rufo-ferrugineo, in disco postico obsolete 
longitudinaliter bifoveolato, elytris testaceis, apicem versus necnon 
interdum in regione scutellari obscurioribus, abdomine ineequaliter 
fusco-piceo, antennis valde clavatis (clava fusco-piced), ad basin 
pedibusque rufo-testaceis. 
Long. corp. lin. 14-1}. 
O. narrow and linear, densely and minutely alutaceous all over, with 
very distant and shallow punctures (which are almost absent on 
