ii4 MEMOIRS ON THE COLEOPTERA 



abruptly narrower than the mentum, the latter setose. [Type 



Scarabceus barbatus Fabr.] Neotropics *Parachalepus n. gen. 



20 Body nearly as in Dyscinetus, but with the elytra more deeply sulcate 

 and the hind tibiae stouter; post-coxal process of the prosternum 

 long, gradually acuminate, differing radically from the form assumed 

 in either of the preceding genera; mentum generally more tumid 

 centrally. [Type Geotrupes laborator Fabr.] Neotropics, more 

 especially in South America *Stenocrates Burm. 



In this scheme I have been obliged to omit three of Burmeister's 

 genera: Pachylus, which having 9-jointed antennae and the outer 

 claw of all the tarsi dentate beneath, should form a separate tribe 

 of the Rutelinae according to Arrow,- Democrates, distinguished 

 from all the others by the long acuminate mentum and Harposcelis. 

 In addition to these the number of genera will be increased con- 

 .siderably by types which are still unknown to me. Mr. Gilbert 

 J. Arrow (Ann. Mag. Nat. Hist.) describes, for instance, a number 

 of Central American Cyclocephalid species, some of which, besides 

 those noted above, such as acuta, prolongata and brevissima, appar- 

 ently betoken special generic types and such forms as fuliginea, 

 curta, proba and nigerrima, as figured in the Biologia, would cer- 

 tainly seem to indicate still other genera or subgenera. 



Mononidia n. gen. 



The general habitus of the type of this genus is quite unlike that 

 of any other species known to me, either in nature or by description ; 

 this is due largely to the intensely black shining surface, large head, 

 cylindric form and sulcate elytra. The mandibles are slender, 

 parallel, obtusely rounded at tip, with the lower part of the surface 

 at apex swollen; they are exposed, when open, at the sides of the 

 very large clypeus; the maxillary galea is bifid at apex as usual and 

 the palpi are very moderate in development. The mentum is oval, 

 slightly elongate, evenly convex, coarsely and sparsely punctate, 

 having stiff sparse hairs arising from the punctures, and the apex 

 or ligular part is abruptly constricted, its apex transverse and with 

 a very minute median notch. The antennas and eyes are of moder- 

 ate size and proportion. The type may be described as follows: 



Body of rather large size, cylindric, parallel, strongly convex, shining and 

 deep black throughout, the palpi and antennae piceous; sterna gla- 

 brous; head large, with sparse and moderate punctures throughout, 

 the clypeus arcuate, broadly but moderately reflexed and sculpture- 



