6 Rev. H. S. Gorham's materials for a 



Hyas, Castelnau. 

 Hyas denticornis, Germ. Ins. Nov. Spec. p. 67, $ , 2. 

 Brazil, all collections [Rio Jan., Brus. M.]. 



Hyas scissiventris, Perty Del. An. Art. p. 26. (PI. VI. 



fig. 2.) 



Brazil. 



Obs. — Apparently a variety of the preceding, in which 

 the central fascia is more divided than usual. 



Hyas bipunctatus, n. sp. 



Niger, thorace antice maculis duabus pallidis trans- 

 lucidis, angiilis posterioribus subacutis, elytris thorace 

 latioribus, postice angustatis, punctis duobus lateralibus 

 paulo post medium sitis, pallidis. Subtus nigro-fuscus, 

 abdomine medio tantum flavo notato. 



Long. lin. 5 — 6 ; lat. 4|. 



The characters of the apical segments of the abdomen 

 of the male are similar to those of denticornis. The 

 pygidial and ventral plates together form a circular 

 opening. 



Brazil? Threes. ColL Gorh. (Norris). 



Hyas rliomboidea, n. sp. 



Fusca, thorace transversim subquadrato, lateribus antice 

 paululum angustatis, vittis duabus croceis, disco nitido, 

 elytris flavis dimidio apicali, maculisque duabus lateralibus, 

 nigris ; abdomine segmentis ventrahbus medio flavis. 



Long. lin. 8 ; lat. 4. 



Mas. — Segmento sexto ventrali medio exciso, bidentato, 

 dorsali bilobato, uncinato. 



Oblong, parallel, rather flat elytra, a little wider than 

 the thorax, the latter squarish, the front margin a little 

 produced, little reflexed, the yellow vitt^ are placed in two 

 shallow foveffi, which extend from front to base, the disc 

 and sides elevated, the former finely carinate. ScuteUum 

 black, shining. Elytra with the sides parallel, shoulders 

 and apex rounded, sutural angle also roiuid ; the humeral 

 callus is well raised, basal expanded margin reflexed, 

 ochreous-yellow, a large lateral spot and the apical half, or 

 rather less, smoky-black. Legs black, anterior trochanters 

 yellow. Antennae black, with fairly-long lamellae. 



The ventral claspers are singular and much more deve- 



