DESCRIPTIONS OF NEAT SPECIES. 105 



quasi diviso ; mandibular apice emarginata?. Maxillse elongatse lobis 

 angustis pilosis ; palpi niaxillares (maris) elongati, articulo lmo parvo, 

 2ndo elongato, 3io breviore, 4to 2ndo baud breviore, dilatato, latitudine 

 duplo longiore, latere exterrio concavo, interuo curvato iufra medium sub- 

 augulato. Mentum trapezoideum late coucavum, medio carinatum ; ligula 

 late emarginata; palpi labiales breves, articulo ultimo dilatato, apice ob- 

 lique rotuudato. Elytra elongata, tborace latiora, dense punctata, lineis 

 utrinque quatuor elevatis vix distinctis. Pedes elongati, coxis intermediis 

 contiguis, tibiis omnibus apice bicalcaratis ; tarsis articulis pluribus subtus 

 spongiosis, uuguiculis angustis basi parum dilatatis. 



473. C. qiiadrimacillata. Probosca quadr. Motsch. Etudes Ent. 

 1S52, 7b ; Nacerdes quadrimaculata Mannh. Bull. Mosc. 1S53, 267. 



California. The sexual characters of this species are somewhat 

 remarkable : the fifth ventral segment of the male is deeply 

 sinuate each side, and prominent at the middle, the lobe being 

 slightly truncate at tip ; from beneath the fifth ventral proceed 

 two long spatulate appendages, which when closed together 

 nearly conceal the penis ; under the last mentioned organ is a 

 slender elongate corneous process, with two hooks at the ex- 

 tremity. The female is unknown to me. 



OXACIS Lec. 

 The species of this genus are numerous, and are readily recog- 

 nized by the tip of the mandibles being acute, the claws very 

 slightly dilated at base, the anterior tibice having two terminal 

 spurs, and the tarsi having only the penultimate joint spongy 

 beneath. The species in my collection may he divided into three 

 groups, according to the shape of the last joint of the maxillary 

 palpi. The last joint of the antennae is feebly sinuate in the 

 male of all the species; the right mandible in 0. dorsalis is 

 armed with a small tooth on the upper edge near the tip : — 



A. Last joint of maxillary palpi subcultriform, inner side subangulated 

 nearer the base than the tip ; 

 Prothorax with a median vitta and lateral spots dark colored ; 

 Elytra strongly punctured, finely pubescent (color varied), can a. 

 Elytra feebly punctured, densely pubescent. PALLIDA. 



Thorax convex, without medial dark line; 



Color pale, sides of thorax dark. t.e.viata. 



Color black, thorax rufous or yellow; 



Thorax immaculate. thobacica. 



Thorax with basal and apical black spots. ROTOXOides. 



Thorax broadly concave ; color piceous. orakulata 



