168 NEW SPECIES MELYRIDAE, CHRYSOMELIDAE AND TENEBRIONIDAE 



Pronotum transverse, about a fourth wider than long, almost evenly 

 convex; apex broadly arcuate; sides broadly and moderately strongly 

 arcuate, widest a little behind the middle, arcuately convergent anteriorly, 

 angles broadly rounded, the basal sometimes slightly obtuse ; base broadly 

 arcuate, feebly sinuate laterally within the angles when obtuse ; disk dull 

 in lustre and densely indentato-punctate. 



Elytra oblong, about twice as long as wide ; apex rather parabolically 

 rounded ; not deeply punctate, punctures separated by a distance equal to 

 one or two times their diameter, surface more or less transversely and 

 feebly rugose, punctures finer toward apex. 



Abdomen finely and very densely granulato-punctate ; pubescence 

 almost hiding the body surface ; fifth ventral segment modified on the disk 

 in the male. 



Legs moderate in length and stoutness ; metafemora rather strongly 

 arcuate dorsally in basal third, rather stout and subparallel, i. e., less 

 narrowed at base. 



Male. Slightly narrower, subparallel, antennae slightly heavier; 

 fifth ventral segment distinctly sinuate, adjacent surface impressed and 

 asperate, impressed area invested with black hairs which are not noticeably 

 bristling, pubescence unmodified beyond margin of the impression, some- 

 times brownish, especially on the genital segment, tactile hairs rather long 

 and somewhat numerous. 



Female. Slightly broader, a little more ovate ; antennae a little more 

 slender, anterior margin rather less serrate. Metafemora rather more 

 parallel ; fifth ventral broadly rounded at apex. 



Measurements. Length (Types), 3.2 mm.; width, 1.2-1.3 mm. 



Holotype, male, in my own collection ; allotype, female, in that of the 

 California Academy of Sciences ; paratypes in both collections. 



Type locality. Bartlett Springs, Lake County, California. Collected 

 in June by Dr. A. Fenyes. 



Distribution. Besides the typical phase taken at Bartlett Springs, I 

 have eight specimens from Pasadena, in Southern California. These are 

 smaller with the apical joints of the antennae somewhat darker, and the 

 central pronotal constricted macula is represented by a rounded macula 

 corresponding to the basal lobe of the "hourglass" spot. In the males 

 the impressed area of the fifth ventral is quite glabrous and the 

 pubescence is longer at the angles. In some Listri there is an apparent 

 sixth segment, but it is exceedingly difficult to determine the true structure 

 in dried specimens, especially when they are few in number. Careful 

 dissection is necessary. 



From reading Casey's description of Listrus tritus Casey, one would 

 refer niveicanthus to that species as regards maculation. In tritus the 



