172 MADEIRAN COLEOPTERA. 
species which constitute it differ so materially from the other Ma- 
deiran Oxypode, I have preferred retaining it as separate in this 
Catalogue,—deeming the present observation, concerning its affini- 
ties, sufficient. 
485. Xenomma planifrons. 
Xenomma planifrons, Woll., Ins. Mad. 544. tab. xiii. f. 4 (1854). 
Inhabits the damp sylvan districts of Madeira proper; occurring 
amongst shingle, and fallen leaves, at the edges of the small trickling 
streams of a lofty elevation. Rare. 
486. Xenomma formicarum. 
Xenomma formicarum, Woll., Ins. Mad, 545 (1854). 
Inhabits Madeira proper; occurring beneath logs of wood, and 
fallen leaves, at intermediate and lofty altitudes. 
487. Xenomma filiforme. 
Xenomma filiforme, Woll., Ins. Mad. 545 (1854). 
Inhabits Madeira and Porto Santo; occurring at intermediate ele- 
vations. 
Genus 209. HOMALOTA. 
Mannerheim, Brachel. 73 (1831). 
488. Homalota truncorum, n. sp. 
H, nigra alutacea subtiliter pubescens et fere opaca, capite protho- 
raceque leviter obsolete punctatis, illo postice subquadrato, hoe ro- 
tundato antice truncato, elytris valde abbreviatis,abdomine nitidiore, 
ultra medium dilatato, ant:nnis pedibusque piceo-ferrugineis. 
Long. corp. lin, 1-1}. 
H, black, most densely alutaceous all over, and sparingly clothed 
with a minute pubescence, which is longer and coarser posteriorly 
than elsewhere. Head, prothorax, and elytra almost opake: the 
first rather more evidently punctured than the two latter (on 
which the punctures are only just perceptible even beneath the 
microscope), and squarish behind the eyes,—which are small, much 
depressed, and composed of only a few lenses : the second of about 
the same breadth as the head, round behind, and truncated in 
front: the third exceedingly abbreviated, and somewhat emar- 
ginate (conjointly) along their posterior edge. Abdomen a little 
more shining, and less alutaceous, than the rest of the surface, 
and a good deal expanded beyond the middle. Limbs short, pubes- 
cent, and piceo-ferruginous ; the antenne rather darker towards 
their extremity. 
The minute size, posteriorly expanded outline, and dark hue of 
