502 REVISION OF THE ELATERID.E 



Plastocerus \. Schaum. 

 Frons planiuscula, antice sensim deflexa, non marginata: oculi convexi prominuli: labrum trans- 

 versum antice rotundatum, cum fronte arete connatum: mandibular longiusculse, minus tenues, vix 

 acutae: palpi articulo ultimo vix longiore cylindrico : antenna? pilosar, flabellatae, 11-articulatae, arti- 

 culo l" 10 crassiore; 2 — 10 gradatim paulo longioribus, 4 — 10 ramo externo cylindrico valde elongato 

 apicali instructis; ll mo ramo praecedentis longiore, cylindrico: prosternum antice vix rotundatum, 

 postice longe mucronatum: coxae anticae parvaa, mediae maiuscular contiguae, posticar laminis angustis 

 intus paulo latioribus : tarsi longiusculi, pubescentes, articulis 1 — 4 sensim brcvioribus, 5'° longiore 

 unguiculis integris : tibiee tenues calcaribus minutis : abdomen 5-articulatum. 



• A specimen of this insect was sent by me to Dr. Schaum, who pronounced it strictly' 

 congeneric with Callirhipis angulosus Germ., an insect found in Smyrna, and which 

 forms in the Catalogus Coleopterorum Europte the type of the unpublished genus Plas- 

 tocerus. 



The characters are very distinct, as given above; the general form of the body is that 

 of Cebrio, but more slender; the mandibles are shorter and less acute than in the 

 other genera of this group, and close together just beyond the labrum, so as to leave no 

 open space as in Aphricus and Cebrio; the labrum is closely soldered to the front, as in 

 Cebrio, leaving merely a transverse line; the small size of the anterior coxaa shows the 

 persistence of the Elater type. The abdomen, though apparently only 5-jointed, is 

 slightly dehiscent at the apex, permitting the sixth internal joint to be seen. 



1. P. Schaumii, piceo-castaneus, helvo-pubescens, capite thoraceque pilis longioribus crectis 

 densius vestitis, illo scabro, hoc antrorsum angustato, lateribus sinuatis, angulis posticis elongatis, 

 divergentibus, dense punctato, elytris striis vage impressis, interstitiis subrugosis, pectore longius 

 cinereo-pubescente. Long. *47. 



San Diego, California, May and June, abundant, flying about just before sunset, and 

 alighting on bushes, near the shore of the bay. In the male, the thorax is gradually 

 narrowed from the base, and slightly angulated before the middle; in the female, the sides 

 are parallel from the base of the spines to the middle, then rounded to the apex. This 

 insect has very feebly the power of springing. 



EUTHYSANIUS LcC. 



Frons planiuscula, antice subito devexa, non marginata: oculi convexi prominuli: labrum breve, 

 antice subsinuatum: mandibular modice elongatae, acuta?, medio dentatae : palpi articulo ultimo non 

 longiore, cylindrico: antennae pilosre flabellatse, 12-articulatae, articulo l mo crassiore, sequentibus duo- 

 bus sequali; 3'° 2 n<1 ° paulo longiore; 4 — 11 sensim paulo longioribus, ramo externo valde elongato, 

 cylindrico apicali instructis, 12" lu cylindrico, ramo praecedentis sesqui breviorc : prosternum antice vix 

 rotundatum, sutura latcrali obliqua recta, postice mucronatum: coxae anticae parva?, media: fere conti- 

 gua\ posticse laminis angustis, intus latioribus: tarsi longiusculi pubescentes, articulis 1 — 4 sensim 

 brevioribus, , r >'" longiore, unguiculis integris: tibiar tenues, calcaribus parvis : abdomen 5-articulatum. 



The appearance is entirely that of Plastocerus, but the Pi-jointed antenna?, and the 

 more prominent and acute mandibles, compel me to separate this species. The labrum is 

 more porrected than in the preceding genus, and is nearly horizontal, not following the 

 convexity of the anterior part of the front, which is almost perpendicular. 



