June, 1908.] SCHAEFFER : LlST OF THE L.A.MPYRID.E. 67 



ventral segment broadly, triangularly emarginate ; last ventral longitudinally divided. 

 Female. — Antennae reaching almost to middle of elytra; joints less elongate 

 than in the male. Thorax about twice as wide as long ; apical margin truncate ; 

 front angles obliterated ; lateral margin rather strongly reflexed, feebly arcuate, 

 sinuate at middle and near the hind angles, the latter rather acute. Last ventral 

 truncate at apex ; on each side of middle the segment is distinctly impressed. 



Huachuca Alts., Arizona. 



This species which occurs also in the Chiricahua Mts., Arizona (E. 

 A. Schwarz), is related to perforatum Lee, but the much shorter 

 lateral thoracic processes of the male and the different color of 

 abdomen and legs will separate abdominalis from that species. 



The sinuation of the lateral margin of thorax at middle is in some 

 specimens feeble, in others very pronounced. The ventral segments 

 are more or less distinctly bordered with yellow. 

 Plectonotum excisum, new species. 



Black, prothorax and front of head pale or red. Head and thorax minutely and 

 sparsely punctate. Thorax with front margin arcuate, angles obliterated ; basa' 

 margin truncate at middle, slightly oblique each side, angles obtuse. Elytra rugosely 

 punctured and finely pubescent. Body beneath sparsely and finely pubescent. 

 Length 5 mm. 



Male. — Lateral margin of thorax feebly obliquely narrowing, from the hind 

 angles to basal half and at this point suddenly dilated, with the sides broadly rounded, 

 reflexed and continuous with the apical margin. Penultimate ventral segment feebly 

 emarginate ; last ventral segment divided. 



Female. — Lateral margin of thorax very feebly sinuate at middle. Last ventral 

 segment with a small arcuate emargination at middle of apical margin. 



Huachuca Aits., Arizona. 



The genus Plectonotum Gorh. is closely allied to Si/is and Polemius 

 and was erected for a small black species from Ecuador on the peculiar 

 form of the thorax of the male. 



Malthinus subcostatus, new species. 



Head black, front reddish, finely pubescent. Antennae black, slender. Thorax 

 red, subquadrate, front margin very feebly rounded ; front angles obtuse ; sides nearly 

 parallel, straight ; hind angles obtusely rounded ; basal margin truncate at middle 

 and on each side oblique ; surface smooth, shining. Elytra about one third shorter 

 than the abdomen, black, apex yellow ; surface coarsely sculptured and very in- 

 distinctly punctured, the punctures not forming striae ; each elytron with two moder- 

 ately pronounced costae. Body beneath and legs piceous, except head and thorax, 

 which are reddish. Length 4 mm. 



Huachuca Mts., Arizona, one female. 



Differs from atripennis and occipitalis by the different coloration 

 and sculpture of elytra ; the red thorax, black legs, and sculpture of 

 elytra will separate it from allied Mexican species. 



