ART. 16 WASPS OF THE SUBFAMILY BEACONINAE MUESEBECK 19 



as long as the second; nervellus not angled; abdomen short, about 

 as long as the thorax, entu-ely polished; first tergite slightly longer 

 than broad at apex, and at least two and one-half times as broad at 

 apex as at base. Head entirely (except mandibles which are red) , 

 pectus, mesopleura, metapleura, propodeum, all coxae and tro- 

 chanters, apex of posterior tibiae, and the posterior tarsi black; 

 extreme apex of middle tibiae and their tarsi dusky; pronotum and 

 propleura, mesoscutum, scutellum,and metanotum testaceous ; abdo- 

 men ferruginous; wings infumated, the anterior pair more weakly so 

 apically and completely hyaline along apical margin. 



Male. — Antennae of allotype with 32 segments; otherwise as in the 

 type. 



Type.— C&t. No. 28695, U.S.N.M. 



Type locality. — Mount Hood, Oregon. 



Described from one male and one female. Undoubtedly additional 

 specimens will exhibit more or less variation in the color of the thorax 

 and legs. In the type one hind coxa is black while the other is red, 

 suggesting the variability of these parts. 



3. CRASSOMICRODUS FULVESCENS (Cresson) 



Microdus fulvescens Cresson, Proc. Ent. Soc. Phila., vol. 4, 1865, p. 297. 

 Crassomicrodus fulvescens Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 128. 



Type. — No. 1727.1, Academy of Natural Sciences, Pliiladelphia, 

 Pennsylvania. 



This species can be distinguished especially by its uniformly honey- 

 yellow color, its broad, strongly swollen cheeks and temples, and the 

 relatively short inner spur of hind tibia, wliich is hardly half as long 

 as the basitarsus. Rarely the propodeum is more or less blackish; 

 the legs, including the coxae, are pale testaceous, with all trochanters 

 usually, though not always, black; wings rather uniformly infumated 

 with large hyaline spots in the first cubital and second discoidal cells; 

 eyes not strongly convex, rather small ; malar space more than half 

 as long as the eye height; cheeks and temples as broad as the eyes; 

 antennae usually 36 to 38 segmented; apical segment of posterior 

 tarsi very slender, about as long as the second segment. 



In addition to the type about 15 spscimens have been examined, 

 all of these being in the National Museum; they are from various 

 localities in Colorado, Texas, Kansas, New Mexico, and Arizona. 



4. CRASSOMICRODUS MEDIUS (Cresson) 



Microdus mediiis Cresson, Proc. Ent. Soc. Phila., vol. 4, 1865, p. 298. 



Type. — No. 1725, Academy of Natural Sciences, Philadelphia, 

 Pennsylvania. 



Resembles divisus exceedingly closely in color, differing, however, 

 in having the fore and middle legs beyond the trochanters entirely 



