BEMBIDIIN/E 59 



width 2.35-2.9 mm. New Mexico (Jemez Springs and Las Vegas) 

 and Utah (St. George), Wickham. Abundant. Seventeen speci- 

 mens acomanum n. sp. 



Head larger, subequal in width to an elytron 25 



25 Form elongate, rather convex, piceous-black, with greenish lustre, 

 the neck and a few small spots near the sides of the pronotum nubi- 

 lotisly paler, the elytra obscure testaceous, the broad medial band 

 so feeble and nubilous as to be barely traceable; under surface black, 

 the abdomen partially rufous, the epipleura rufous, the legs pale 

 flavo-testaceous; head fully four-fifths as wide as the prothorax, 

 with moderately prominent eyes, the antennae fuscous, paler basally, 

 long and slender; prothorax parallel, about a fourth wider than long, 

 the sides broadly arcuate and more feebly so than usual, becoming 

 very feebly sinuate toward the hind angles, which are rather more 

 than right but neither blunt nor markedly prominent; surface nearly 

 as in the preceding; elytra three-fifths longer than wide and more 

 than two-thirds wider than the prothorax, parallel, with broadly 

 arcuate sides, very gradually and strongly rounded behind; striae 

 rather coarse and impressed, the punctures strong and notably close- 

 set, the seventh stria virtually wanting; foveae before anterior and 

 at posterior third. Length (9) 7-3 mm.; width 2.65 mm. Ari- 

 zona (Tugson) excursion n. sp. 



Form less elongate, similarly convex and shining, black, with greenish 

 lustre, the elytra yellow-brown, with a broad and moderately def- 

 inite black median fascia, prolonged slightly medially behind; under 

 surface piceous-black, the legs flavate; head three-fourths as wide 

 as the prothorax, with remarkably prominent eyes, the antennae 

 long, slender, fuscous, paler basally; prothorax shorter than in the 

 two preceding, two-fifths wider than long, the sides subprominently 

 rounded before the middle, oblique and straighter anteriorly and 

 posteriorly, slightly sinuate just before the basal angles, which are 

 scarcely more than right, sharp and evidently prominent; surface 

 nearly as in the preceding, the carina obsolete or indistinct; elytra 

 parallel, with scarcely arcuate sides, circularly rounded in apical third, 

 one-halt longer than wide, barely one-half wider than the prothorax; 

 striae abrupt and scarcely at all impressed, the seventh series fine 

 but usually distinct and entire; punctures small and close-set; foveae 

 at two-fifths and two-thirds. Length (c? 9 ) 5.8-7.0 mm.; width 

 2.15-2.75 mm. California (coast regions from San Francisco north- 

 ward. San Diego, LeConte). Abundant. Thirteen specimens. 

 [Ochthedromns mannerheimi \\ Lee.?] erosum Mots. 



26 Body notably depressed, the thoracic base much wider than the 

 apex. Polished black, with but faint metallic lustre anteriorly, the 

 elytra uniform pale castaneous in color; under surface black, the 

 legs pale rufous; head three-fourths as wide as the prothorax, much 

 narrower than an elytron, the shining sulci coarse and very deep; 

 eyes large but not very prominent; antennae long, slender, fuscous, 

 paler basally, almost as long as the elytra, the medial joints three 

 times as long as wide, cylindric; prothorax a fourth wider than long, 

 the sides evenly and rather strongly rounded, oblique and feebly 



