178 Journal New York Entomological Society, t^'oi- xxv. 



Hydroporus arizonicus new species. 



Ovate elliptical, finely pubescent, flavotcstaceous, elytra with vittiform 

 markings of the sericeiis type, luster dull in the female and scarcely more 

 shining in the male; punctuation of thorax and elytra dense, the punctures 

 separated by less than their own diameters or nearly in contact, punctures of 

 head finer and less dense. Front very distinctly impressed each side, clypeus 

 somewhat thickened. Prothorax with broad side margins, disk with a some- 

 what diffuse brownish cloud occupying the middle third or more, and extend- 

 ing from base nearly or quite to the apex. Elytra less than one half longer 

 than wide, the sides straight and parallel for nearly half their length from a 

 point just behind the base. The elytral vittse, as in sericeiis, consist of longer 

 ■and shorter dashes which are variably coalescent, both longitudinally and 

 transversely, the darker areas as a rule predominant. Body beneath coarsely, 

 densely punctate, the punctures at corresponding parts evidently coarser and 

 rather denser than in sericeiis. Front tarsi of male rather widely dilated, 

 with claws a little thicker, straighter, and slightly sinuate on their inner edge; 

 the anterior one just perceptibly shorter. Length 4.6 to 5.2 mm. ; width 2.35 

 to 2.55 mm. 



Arizona (Tucson). Ten examples from the Sherman and Rob- 

 erts collections. The type is a male. 



This species is most nearly related to sericeiis and dimidiatus but 

 is larger than either, with sides of elytra more parallel basally. The 

 prothoracic discal cloud will at once separate it from any allied form. 

 In dimidiatus the prothorax is entirely pale, at most with the extreme 

 basal edge very narrowly infuscate at middle. In sericcus both apical 

 and basal margins are distinctly blackish except at sides. 



Hydroporus tigrinus new species. 



Size small, moderately elongate, subovate, sparsely, finely pubescent and 

 moderately shining, though with the usual finely alutaceo-reticulate ground 

 sculpture; rufotestaceous, the abdomen commonly darker rufous or rufo- 

 piceous at sides, especially basally ; elytral disk predominantly fuscous, with 

 confluent linear markings. Head entirely rufotestaceous, finely, sparsely punc- 

 tate and distinctly biimpressed, clypeus not appreciably thickened. Antennae 

 moderate, entirely pale except for the apical half of the terminal joint. Pro- 

 thorax finely and sparsely punctate medially, becoming rather closely and 

 strongly so at base and apex, side margin rather wide ; a small diffuse fuscous 

 spot at the middle of the apical margin, basal margin usually narrowly infus- 

 cate in middle half, sometimes scarcely at all so. Elytra widest at about basal 

 fifth, moderately, arcuately attenuate posteriorly, punctuation at base rather 

 coarse, becoming gradually very fine at apex, the punctures separated on the 

 average by twice their own diameters, somewhat closer basally. The mark- 

 ings may be described as vittiform in character, more or less transversely con- 



