6 HETEROMERA. 
coarse rounded punctures, ventral segments sparingly but not very finely punctured; metasternum longi- 
tudinally impressed in the middle. ‘ 
Length 8-9 millim. 
Hab. Nicaracua, Chinandega (Sallé), Chontales (Beit). 
Two examples. These specimens differ slightly inter se: the elytra are a little more 
parallel in the Chinandega individual and the interstices more distinctly punctured. 
2. Mencheres elongatus. (Tab. I. fig. 4.) 
Elongate oval, convex, reddish brown, pubescent, slightly shining. Head rather convex, coarsely and sparingly 
punctured in front, more finely behind; prothorax rather convex (especially in front), rounded at the 
sides, transverse, very slightly narrowed and sinuate behind to the subacute hind angles, narrowed a little 
in front to the rather prominent acute anterior angles, base strongly bisinuate, slightly impressed trans- 
versely near the base just within the slightly raised margin, closely and finely punctured; elytra about 
three times as long as the thorax, a little wider than the thorax at the base, slightly rounded at the sides, 
humeral angles obtuse, with regular rows of rounded punctures (more distinct outwardly), the interstices 
flat with scattered fine punctures distinct towards the suture, obsolete at the sides, and each with a row of 
short appressed yellowish hairs. Beneath shining; ventral segments sparingly and finely punctured, the 
rest somewhat coarsely and sparingly punctured ; metasternum faintly impressed longitudinally down the 
middle. 
Length 9 millim. 
Hab. Guatemata, El Jicaro in Vera Paz (Champion). 
Two examples. Closely allied to M. nicaraquensis, but longer, the intercoxal process 
acuminate and pointed in front, the thorax a little more finely and more sparingly 
punctured, &c. 
POSIDES. 
Mentum rather large, transverse, slightly angular at the sides, feebly emarginate in front, closely fitting to the 
side pieces of the submentum; mandibles strongly toothed on the upperside, the tooth on the right side 
strong and stout, that on the left short and slightly pointed, the lower longer lobes broad and truncate at 
the apex; maxillary palpi stout, apical joint broad oval; labrum almost completely and mandibles in 
greater part hidden by the epistoma; ligula entirely concealed; head short and broad; epistoma broad, 
almost truncate in front, a little produced triangularly in the middle and deflexed, lateral lobes rounded, 
not prominent, slightly impinging on the eyes behind; eyes large, rounded, carinated within; prothorax 
transverse, convex, strongly margined, the front angles rather prominent, strongly bisinuate at the base, 
and fitting closely to the elytra, coarsely punctured; elytra convex, oblong-ovate, with regular rows of 
deep coarse punctures; antenne rather long, not very stout, third joint half as long again as the second, 
fourth to eighth decreasing in length and oboval, ninth and eleventh broader, subtriangular, eleventh 
rounded ; legs short, tarsi stout, densely clothed with hair beneath; intercoxal process rounded in front; 
epipleuree narrow, distinct to the apex; scutellum small, transverse; intermediate coxal cavities entirely 
closed externally ; prosternum narrow, decliyous behind. 
One species from Mexico. Superficially resembling somewhat the genus Helops. 
1. Posides dissidens. (Tab. I. fig. 2.) 
Oblong oval, very convex, dark reddish brown or black, shining, apterous. Head dull, strongly impressed 
transversely in front with a few scattered fine punctures; prothorax transverse, convex, impressed trans- 
versely along the base, rounded at the sides, equally narrowed in front and behind, lateral and basal 
margins and the slightly prominent subacute anterior angles a little raised and prominent, base strongly 
