June, 1908.] SCHAEFFER : LlST OF THE LaMPYRIDjE. 63 



Notes and Descriptions. 

 Lycostomus rubescens, new species. 



Head black ; beak moderate. Antennae black, serrate ; third joint slightly 

 longer than fourth. Prothorax orange-yellow, more or less densely pubescent. 

 Elytra reddish, costate and reticulate, the alternate intervals slightly more prominent 

 than the others. Body beneath reddish, except the metasternum which is more or 

 less dusky and the abdomen which is also sometimes feebly dusky. Femora more or 

 less blackish. Tibiae and tarsi black. Length 12-13 mm. 



Male. — Antennal joints more elongate and serrate than in the female ; penulti- 

 mate segment triangularly incised at middle, with the angles of the incisure rounded. 

 Last ventral segment as usual. 



Female. — Antennae feebly serrate, joints shorter than in the male. Last ven- 

 tral segment lobed at middle, the lobe triangularly incised at middle. 



Huachuca Mts., Arizona. 



This species is allied to fulvellus Lee. from which it differs, be- 

 sides coloration, in having the antennas more serrate and the penulti- 

 mate ventral segment of the male differently formed. It resembles 

 also quite closely the Mexican lineicollis Chev., but that species has 

 the underside of body, legs, a broad thoracic and a scutellar spot, 

 black. The known North American species of the genus Lycostomus 

 may be separated by the following table : 



I. Elytra unicolorous, either yellow or reddish 3 



Elytra in great part black or red, with an apical black space 2 



2. Underside of body and legs black ; elytra black with elongate humeral spot and 



sometimes the base on each side of suture fulvous lateralis Mehh. 



Underside and legs red, tarsi black; thorax and elytra red, the latter at apical 

 fourth, black ; penultimate ventral segment of male broadly, triangularly 

 emarginate sanguineus Gorh. 



3. Underside in great part black ; abdomen with last two segments and sides more or 



less fulvous ; thorax with a median black spot dilated at base and sometimes 

 near apex ; penultimate ventral segment of male truncate-emarginate. 



fulvellus Lee. 

 Abdomen unicolorous, rarely feebly dusky at middle in rubescens 4 



4. Prothorax shining, not pubescent ; third joint of antenme as long, or nearly as 



long, as the next two ; penultimate ventral segment of male emarginate-trun- 



cate loripes Chev. 



Prothorax feebly shining, pubescent ; third antennal joint slightly longer than 

 fourth, but distinctly shorter than joints three and four ; penultimate ventral 

 segment of male triangularly incised at middle, angles of incisure rounded. 



rubescens n. sp. 

 Plateros nigerrimus, new species. 



Entirely black. Head feebly punctate, transversely impressed between the 

 eyes. Antenna; distinctly serrate in the male, more feebly and the joints broader in 



