DESCRIPTIONS OF FOUR NEW SPECIES OF DISONYCHA. 147 



black; antennsB scarcely extending to the middle of the elytra, black, 

 the basal two joints (sometimes) fiavoas ; the fourth and fifth joints 

 equal, longer than the third ; thorax more than twice as broad as long, 

 the sides feebly rounded, with a narrow margin, the anterior angles 

 obtusely rounded, the posterior ones oblique, the disc with an obsolete 

 transverse sulcus near the base, impunctate, pale fulvous, all the 

 margins narrowly flavous ; elytra with a few fine punctures near the 

 suture, the rest of the surface impunctate, with five more or less dis- 

 tinct longitudinal costse, the first and the fourth pale flavous, the lateral 

 margins and the elytral epipleurae of the latter colour ; the breast and 

 the basal segments of the abdomen black, the others flavous ; the 

 femora fulvous ; the tibiae and tarsi black. 



Hafe.— East Florida, St. John's Bluff. 



This species, of which two exactly similar specimens are 

 contained in my collection, does not seem to have been known 

 to Dr. Horn, who published a " Monograph of the North American 

 Halticidse" (Trans. Am. Ent. Soc. xvi. 1889). D. pensylvanica, 

 Illig., seems the most nearly aUied species, but differs totally in 

 the coloration of the head, the elytra and under side, and in the 

 want of the elytral costse. D. costipennis, Jaeq. Duval, from 

 Cuba, seems to agree in the costate elytra with the present 

 insect, but the author says nothing of the pale thoracic margins 

 nor elytral bands, nor does Suffrian, who had seven specimens 

 of the last-named species before him, mention this character, 

 although he gives a detailed description of the Cuban insect. I 

 must therefore consider this well-marked American form as new. 



DiSONYCHA ARGENTINENSIS, Sp, n. 



Flavous; head and antennae black; thorax flavous, closely and 

 strongly punctured ; elytra nearly impunctate, black, a subsutural and 

 sublateral posteriorly united band flavous ; the breast, the knees, the 

 apex of the posterior femora, and the tarsi black. Length 5 millim. 



Head deeply rugose-punctate, black with aeneous gloss; antennae 

 short and stout, black, the basal two joints more or less stained with 

 flavous; thorax twice as broad as long, the lateral margins feebly 

 rounded, the anterior angles slightly produced outwards but not 

 pointed, posterior margin oblique at the angles, the surface closely 

 and strongly punctured, flavous, the punctuation partly confluent at 

 the sides ; scutellum broad, impunctate, blackish aeneous ; elytra 

 extremely finely punctured near the base and suture, the rest of the 

 surface nearly impunctate, black, with a narrow subsutural and sub- 

 marginal flavous band joined at the apex, below flavous ; the breast, 

 the knees, the extreme apex of the tibiae, as well as the tarsi, black ; 

 the posterior femora al^o with a black spot at the apex ; the abdomen 

 sparsely clothed with pale pubescence. 



Hab. — Argentine R. 



There are four specimens of this species before me which 

 differ from any of its nearly similarly coloured allies by the rugose 

 sculpture of the head and the close and strong punctuation of 



