154 ENTOMOLOGICAL SOCIETY 



NEW SMYNTHURID^E FROM THE DISTRICT OF COLUMBIA. 

 By NATHAN BANKS. 



The spring-tails of the family Smynthuridae are the most inter 

 esting forms of the order Collembola. They exhibit considerable 

 diversity in structure and habits, and the species are mostly well 

 marked. Several years ago I reported on the forms found on 

 Long Island, N. Y. Since coming to Washington I have been 

 on the lookout for them, and have taken a number of species, 

 most of which were already known. Three, however, are dif 

 ferent from any forms yet known from this country, and their 

 descriptions are presented below : 



Dicyrtoma front alts n. sp. 



Head pale yellowish, a broad brown (nearly black) band connecting an- 

 tennse and then extending back to the hind margin of the head, above a 

 median black dot; in front across face is a broad brown band, the nasus 

 below it being brighter yellow than the rest of the head; the thorax is 

 pale, black-spotted on sides; abdomen above dark purplish thrown, and 

 tubercle more reddish, and showing two pale spots above; basal joint of 

 antennae dark brown, rest paler brown ; legs pale, rather brown on tips of 

 joints; spring pale. Second joint of antennae long and slender, shorter 

 than breadth of head, third about as long as the second, apparently divided 

 into three subequal portions, last joint short, pointed; abdomen short, 

 high, sloping suddenly behind, above beyond the middle is a distinct 

 rounded tubercle each side, and a slight one in the median line behind ; 

 furcula long, the dentes two and one-half times as long as the mucrones, 

 with a few bristles below; mucrones finely serrate below, tip curved down 

 ward; a few hairs on head, a few very short ones on posterior slope of 

 abdomen, longer ones on anal tubercle. Length, 1.2 mm. 



Washington, D. C., January ; under leaves in woods. Readily 

 known by markings of the head. 



Smynthurus facialis n. sp. 



Heal pale brown, with a transverse ivory whiie band, broadest in the 

 middle and slightly pointed below, extending back below base of antennae 

 to the abdomen; vertex with pale spots, a row of them connecting the 

 bases of the antennae; each ocellus surrounded with white; basal joint of 

 the antennae brown, with a white spot above, second joint brown at base, 

 rest pale. Legs banded, femur with a dark band near the tip, three on 

 tibia. Abdomen above white, the basal part with many small ivory white 

 spots, arranged more or less in three rows, the middle one including a 

 brown line; dorsum beyond the middle with irregular white, brown, and 

 a few larger black spots ; anal tubercle above white, with a median black 

 stripe; spring pale purplish; venter pale on apical part, darker on base. 



