Casey — A Revision of the American Paederini. 199 



than wide, parallel and just visibly arcuate at the sides, the apical 

 angles obtuse and one-fifth from the apex, the punctures rather coarse 

 but very sparse, distinct though not deep; elytra large, parallel, only a 

 fifth or sixth longer than wide, fully one -half wider and longer than the 

 prothorax, finely, sparsely and not asperately punctate and strongly 

 shining; abdomen much narrower than the elytra and very distinctly 

 wider than the head; gular sutures extremely feeble, unusually widely 

 separated and but slightly diverging toward base, the intervening space 

 feebly reticulate like the remainder of the surface. Male unknown. 

 Length 3.4 mm. ; width 0.65 mm. California (Lake Tahoe). 



robnstnlns n. sp. 

 8 — Body pale brownish-piceous in color throughout, the head and abdo - 

 men but slightly darker; surface highly polished and without trace of 

 minute reticulation on the pronotum ; form narrow, the head notably 

 narrow and elongate, the eyes only moderate in size, the sides behind 

 them parallel for a long distance, the basal angles broadly rounded, 

 the punctures minute, rather close-set toward the sides and base ; 

 prothorax parallel, nearly a fourth longer than wide, with all the 

 angles about equally rounded, obviously narrower than the head, 

 somewhat coarsely but feebly and sparsely punctate; elytra notably 

 elongate, parallel, one-half wider, and about two -fifths longer than the 

 prothorax, finely, feebly and not very densely punctate ; gular sutures 

 very fine, rather widely separated, diverging also toward base as 

 usual, the intermediate surface apparently in slight relief and more 

 shining and less reticulate than the remainder. Male secondary 

 characters nearly as in punctatus, the truncate lobe of the fifth segment 

 still larger. Length 2.75 mm. ; width 0.6 mm. California (Humboldt 



to Sonoma Co.) pallidas n. sp. 



Body black or piceous-black In color 9 



9 — Elytra gradually paler posteriorly ..10 



Elytra uniformly colored, either black or piceous, concolorous 11 



10 — Form nearly as \npunctatus, the prothorax relatively shorter and the 

 elytra longer, black in color, the legs blackish with the tarsi paler, the 

 elytra gradually and very nubilously rufescent toward tip; surface 

 shining, the reticulation subobsolete on the pronotum; head of the 

 usual form, the eyes well developed, the punctures fine but unusually 

 strong; antennae moderate, with joints two to four decreasing rapidly 

 in length; prothorax unusually small, sparsely and very feebly though 

 more coarsely punctate, only slightly longer than wide, parallel and 

 straight at the sides, distinctly narrower than the head, the obtuse 

 anterior angles at apical fourth or fifth; elytra unusually elongate, 

 parallel, one- half wider and three-fifths longer than the prothorax; 

 gular sutures moderately separated, very fine, the intermediate surface 

 apparently somewhat concave, more shining and less reticulate than 

 the remainder of the under surface, Male unknown. Length 3.0 mm. ; 



width 0.63 mm. Arizona (Pinal Mts.) piualinas n. sp. 



Form rather shorter, black, the legs piceous-black, the tibiae and tarsi 

 gradually paler, brown, the elytra gradually very nubilously piceous 

 toward tip, especially toward the suture; surface polished with the 

 reticulation obsolete ; head as in the preceding species, slightly elon- 



