[353] THE TENTHREDINOIDEA 93 



©cellar basal sharply raised ; frontal crest feebly developed except at 

 the sides where it extends outwardly to the orbits ; antennal fovea cir- 

 cular, deeply excavated; antennae of moderate length, very slender, 

 third joint much shorter than fourth or fifth, which are subequal ; ve- 

 nation normal; stigma broad, regularly rounded beneath; claws 

 deeply cleft ; sheath broad at base, sharply acuminate at apex, emar- 

 ginate beneath. Color black; labrum white; tegulae brown ; tips of 

 femora, tibias except tips of posterior pair and all the tarsi, testaceous ; 

 wings hyaline, nervures pale brown ; stigma yellow, hyaline at base. 



Male: Length 3.5 mm.; resembles female in general structural 

 characters ; antennae almost as long as the entire body, third to fifth 

 joints subequal ; lateral walls of ocellar basin not so sharply raised ; 

 procidentia squarely produced, rounded at apex; stigma brownish, 

 paler at base, colored as in the female. 



Two females and one male, Popof Island, July 12. 



Type no. 5296, U. S. National Museum. 



Allied to Pontania cressoni Marlatt, but that species is larger and 

 the third joint of the flagellum is larger than fourth. 



PONTANIA POPOFIANA sp. nov. 



Female : Length 6 to 6.5 mm. ; robust ; clypeus deeply and narrowly 

 emarginate ; ridges about ocellar basin sharply raised ; frontal ridge 

 strong, unbroken; antennal fovea oval, deeply incised; antennae elon- 

 gate, slender reaching beyond basal plates ; anterior discal cell consid- 

 erably exceeding posterior discal in hind wings ; stigma large, gently 

 rounded below; tarsal claws large, stout, deeply cleft; sheath blunt 

 at apex, rounded above and below. Color reddish yellow; dorsal 

 surface of antennae, eyes, tips of mandibles, spot surrounding ocelli, 

 variable spots on anterior and middle lobes of mesonotum, variable 

 marks on metanotum, dorsulum of abdomen except narrow lateral 

 margins and apical segment, black ; wings hyaline, nervures brown, 

 stigma and costa yellowish hyaline. 



Male: Length 5 mm.; slender, graceful; antennae nearly as long 

 as the entire body, joints three to five subequal ; procidentia project- 

 ing one-half its length, squarely truncate at apex; legs slender, elon- 

 gate ; claws as in the female but more delicate. Color as in the fe- 

 male but the black maculations on the dorsulum are more extensive. 



Ten females and six males, Popof Island, July 9—15. 



Type no. 5294, U. S. National Museum. 



Allied to Pontania nevadense Cresson, but in that species the 

 sheath is acuminate at tip. 



