40 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Head: Front with shallow depressions, margin thick, dark reddish 

 brown, not strongly protuberant above clypeus, angulate and blunt 

 when viewed from above; parantennal fovea large, deep and rounded, 

 foveal tragus weakly developed; nasale usually as wide as or a little 

 less than height, well developed. Mandible with large slitlike pit; 

 palpus reddish brown, antenna exceeds tip of hind angle by 2 or 3 

 segments, segments 2 and 3 subequal, flagellar segments elongate 

 and slender, segment 4 about twice as long as maximum width, erect 

 male hairs sparse, but long and easily seen. 



Pronotum wider than long; punctures in center usually separated 

 by distance equal to less than own diameter, equal to size of punc- 

 tures on front; sides of pronotum straight and divergent posteriorly 

 with slight anterior curvature, hind angles divergent with carina 

 usually extending little cephalad of base. Genitalia as figured; 

 paramere with apical blade. 



Elytron: 10.6 mm (10.1-11.8). 11 spec. 



Female. — Similar to male; antenna 3 a little larger than 2, but 

 still much smaller than 4, so not intermediate in size between 2 and 4; 

 genitalia as figured, accessory gland slender, biu-sa with moderate 

 number of tacklike spines. 



Elytron: 11.8 mm (11.0-12.7). 7 spec. 



Types. — Types of corticinus: "United States," specimens lost. 



Lectotype of glandicolor: Female, no locality data, but stated to 

 be Pa. (MCZ). First specimen of type series selected as lectotype 

 by authors in 1962, but other 2 specimens probably not true types. 



Holotype of vetulus: Female, "America Sept." (ZM). Only 

 specimen in type series. 



Distribution. — Ontario, eastern U.S. west to Illinois and Missouri. 



Illinois: Kankakee, Vermilion; June, July. Indiana: Clark; June. Mart- 

 land: Baltimore; June. Montana: Montgomery; May. New Jersey: 

 Warren; June. North Carolina: Buncombe; June. Pennsylvania: Adams; 

 May. Tennessee: Sevier; June. Virginia: Norfolk; May. Ontario: Pr. 

 Edward. 



Melanotus corticinus is one of the more easily identified species; 

 the small third antennal segment, large parantennal fovea, and large 

 size make its recognition relatively easy. Females with a larger 

 third antennal segment may cause a little trouble in running through 

 the key, but even though the third segment is larger than the second, 

 it is not intermediate in size between the second and fourth and should 

 not be taken out in the wrong part of the couplet. 



20. Melanotus Sagittarius (LeConte) 



Figures 5m, 10c; Plate Ifc 

 Cratonychus Sagittarius LeConte, 1853, p. 480. 



