Casey — A Revision of the American Paederint. 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 distinetly 
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 0.65mm. California (Lake Tahoe). 
robustulus 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 0.5 mm. California (Humboldt 
to SONOMA CO.) -ccceececcccccrcceccccvcccvcccceccosss PALidUs D. Sp. 
Body black or piceous-black 10 CO]OL.+e+seeeee cece ceeesececreretecnvene 9 
9 — Elytra gradually paler poSteriorly....ccseeeceesseccee-secceerererselO 
Elytra uniformly colored, either black or piceous, concolorous...... ceovell 
10— Form nearly as in punctatus, 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.)............+..+-pinalinus 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- 
