304 NEW SPECIES OF COLEOPTEROUS INSECTS. 



Sp. 4. Hyd. curtipennis. Rugose puncta ; pallide testacea, oculis, pro- 

 thoracis lineaque dorsali longitudinali, nigiis: elytra abbreviata, api- 

 cibus incrassatis. (Corp. long. '23 unc. lat. -06 unc.) 



Head finely punctured, pale testaceous, with black eyes, 

 and, in one specimen only, a black vertical spot : prothorax 

 considerably longer than broad, its sides nearly parallel, pale 

 testaceous, with three longitudinal black lines, one on each 

 side, and one down the centre : the elytra are deeply and re- 

 gularly punctured, they are very obviously abbreviated, as in 

 the genus Necydalis, and the apex of each is incrassated ; they 

 are of a uniform pale testaceous colour : the under parts of 

 the body are black : the legs testaceous. 



Inhabits East Florida. Two specimens taken by Mr. 

 Doubleday. 



Sp. 5. Hyd. cegra. Gracilis, elongata, rugose puncta : testacea, oculis 

 tantum nigris. (Corp. long. '18 unc. lat. '04 unc.) 



Head glabrous : prothorax nearly twice as long as wide, 

 and somewhat attenuated posteriorly, glabrous, with scarcely 

 discemable punctures : elytra elongate, linear, thickened into 

 a kind of knob at the tip. The colour is uniformly testaceous, 

 the eyes alone being black. 



Inhabits East Florida. Mr. Doubleday took a single spe- 

 cimen. 



Natural OvdeY.—LUCANITES, Newman. 

 Genus. — Cacostomvs, Newman. 



Dorci facies, at corpore squamoso et mandibulis aliter dentatis plane 

 discrepat. 



The head is small, very much narrower than the protho- 

 rax, and produced in an angle anterior to each eye, which is 

 completely divided, as in Chiasognathus of Stephens, and 

 several cognate genera: the mandibles are porrected, incurved 

 at the tip, and nearly approximate at their base ; they are 

 twice as long as the head ; each, on the internal side, is fur- 

 nished with several teeth of irregular form, and there is little 

 similarity between the two : the right mandible has growing 

 from its upper margin, near the extremity, a tooth, which is 

 directed forwards, and equals the extreme apex in length, so 

 that the apex of this mandible may be termed bifid, while the 

 left mandible, being without this tooth, has the apex simple: 



