■4 [June, 
Oenus 1. — Mesoyelia, Mulsant and Eey. 
Head — long, very much deflected, above widened anteriorly by reason 
of the antenniferons processes ; crown very long, convex posteriorly, 
flattened in front ; face convex, central lobe wide, prominent, side 
lobes shorter, triangular ; antenniferous processes short, obtuse. 
Underside without a rostral channel. Anfetuice 4-jointed, long, 
subfiliform ; 1st joint slightly longest and stoutest, slightly curved ; 
2nd shorter than the 1st ; 3rd and 4th subequal, about as long as 
the first. Eyes moderate, prominent, deeply reticulated. Ocelli 
large, prominent, inserted near the base of the head. Bostrum 
free, slender, subulate, reaching to the second pair of coxse, appa- 
rently 4-jointed ; 1st and 3nd joints very short, 3rd widened at 
the base, very long ; 4th not half the length of the 2nd ; lahrum 
short, triangular, covering the 1st joint. 
Thorax — Froyiotum long, subtrapezoidal, almost campanulate, in front 
but little wider than the base of the head, with the anterior angles 
rounded, widening to the hinder angles, which are prominent, but 
rounded ; sides sinuate ; posterior margin sinuate, almost emar- 
ginate, angles rounded ; disk in front depressed, with two foveas, 
posteriorly very convex, but within the hinder angles deeply 
depressed. Scutellum large, the 1st plate transverse, convex, 
broadly rounded posteriorly ; from beneath its posterior margin 
arises the second plate, narrower, square, concave, truncate, its 
posterior margin elevated. Elytra — in the developed form, 
according to Mulsant and Eey, " furnished with two principal 
nerves and feeble ramifications, forming altogether five cells ; the 
interior large, elongate, elliptical ; the two posterior moderate; the 
two exterior narrow. Membrane without perceptible nervure." 
(In our undeveloped form, the clavus is very broad, membranous, 
posteriorly imperfectly defined ; coriiom., anterior marginal nerve 
thick, on the disk two similarly thick nerves, which posteriorly 
join at an acute angle, beyond which, between the anterior and 
inner nerves, is formed a large subrhomboidal cell ; membrane 
wanting.) Sternum broad, deep. Legs long, thin ; coxoe in large 
cleft sheaths, the 1st pair inserted anteriorly on the prosternum ; 
tliiyhs beneath, and 3rd pair of tibicB, with spinose hairs ; tarsi 
long, trimerous, 1st joint very short, 2nd longer than the 3rd ; 
claws long, fine, curved. 
Abdomen broad, thick, the last segment rounded posteriorly; connexivum 
very broad, reflexed. 
