On a new Genus of Heteromerous Coleoptera. 563 
of attachment or adhesive disk; ¢., cortex; ¢.c., cortical cell; d.o., dermal 
ostia ; fi.c., flagellated chamber ; 7., ingrowth of cortex; p., pith; p.o.s., 
perforation of the oscular sieve; 0.s., oscular sieve; s., layer of spongo- 
blasts ; s.c., spongoblast cap ; ¢r., transition-layer. 
Balfour Laboratory, 
Cambridge, 1902. 
LVI.—Description of a new Genus of [Heteromerous 
Coleoptera. By Cuas. O. WATERHOUSE, F.E.S. 
Tenebrionide. 
APOCRYPHINA. 
PLASTICA, gen. nov. 
Mentum trapezoidal, the angles slightly acute; ligula 
strongly exserted, narrowed towards the base, truncate in 
front (with two points of the hypopharynx projecting beyond 
it in the specimen examined) ; labia] palpi short, the apical 
joint moderately large, somewhat ovate, a little narrowed 
towards the apex, which is slightly obliquely truncate. 
Maxille with the inner lobe furnished at the apex with 
numerous curved bristles, one of which is much larger than 
the others. Maxillary palpi large, the apical joint securiform. 
Mandibles bifid at the apex. Labrum prominent. Antenne 
moderately long, stout, pubescent, slightly thickened towards 
the apex. Head somewhat quadrate, swollen behind the 
eyes ; epistome oblique at the sides, very slightly sinuate in 
front. Amntennary orbits somewhat swollen. Eyes small, 
scarcely prominent, very coarsely facetted. Thorax sub- 
quadrate narrowed at the base, with all the angles much 
rounded ; the sides confounded with the under flanks. Scu- 
tellum small, indistinct. Elytra oblong-ovate, convex, 
dorsally flattened, with the suture impressed. Legs moderate ; 
the front and middle femora much thickened at the middle; 
the posterior pair only gradually narrowed to the base, thick 
at the apex, with a rather deep emargination below at the 
apex, so that there is a distinct angle produced below. 
Tarsi hairy below; anterior with the basal joint a little 
longer than the second, which is (like the third and fourth) 
short; the posterior tarsi are rather longer, with the basal 
joint moderately long, longer than the second and third 
together. The anterior coxe are globose and prominent. 
The sternal process not very broad, almost vertical posteriorly. 
The intermediate coxe not very widely separated. Meta- 
sternum very short. Abdomen with the intercoxal process 
broad; the first aud second segments subequal, the suture 
