44G 



PSYCHE. 



[November iSq6, 



NEW SMYNTHURI, INCLUDING MYRMECOPHILOUS AND 



AQUATIC SPECIES. 



BY JUSTUS WATSON' FOLSOM, CAMBRIDGE, MASS. 



Smynthurtis beuitns. n. sp. 



White everywhere, excepting ferniginous 

 mottlings as specified below, which are absent 

 in young and occasionally in adult specimens. 

 Head free, capped with ferruginous patches, 

 and covered with short, stiff bristles denseron 

 the front; front witli two ferruginous patches 

 which are elliptical, oblique and often united 

 above. Eves absent. Antennie four-fifths 

 the body in length, geniculate, segments 

 nearly as i: 2: 3.5:9; basal segment very 

 stout, naked ; second clavate, petiolate, three- 

 whorled ; third cylindrical, four-whorled ; ' 

 terminal segment (Plate 10, fig. 5) subpeti- 

 olate, about ten-whorled, interrupted just 

 beyond the middle by three distinct subseg- 

 ments, barrel-shaped and subeqnal. Body 

 oval from above, anteriorly almost naked, 

 posteriorly with short, recurved bristles, 

 longer upon the small, rounded anal tubercle ; 

 posterior of abdomen with a pair of broad, 

 subdorsal stripes composed of ferruginous 

 mottlings; sides mottled with ferruginous. 

 Ventral tube stout, emitting two rounded 

 tubercles. Thoracic rings distinctly visible. 

 Legs stout, bristly'. Superior claws of fore- 

 feet slender, well-curved, scarcely tapering; 

 of mid-feet stout, twice the preceding in width ; 

 of hind feet also stout, but smaller and more 

 tapering; all these unidentate on the middle 

 of the inside. Inferior claws of fore-feet very 

 slender and tapering, exceeding the opposing 

 claws in length; of mid-feet half as long as 

 the superior claws, stout, almost straight, 

 obliquely truncate; of hind-feet similar to 

 the last, but smaller and more tapering. 

 Tenent hairs absent. Furcula slender, ex- 

 tending to mouth; manubrium exceeding 

 anal tubercle, swollen ventral ly; dentes 

 scarcely tapering, with lateral and ventral 



rows of stiff bristles at moderate intervals, 

 an extra long ventral bristle beyond the base 

 and another before the apex of each dens; 

 an apical, finger-like process external to the 

 base of each inucro; mucrones nine-tenths 

 dentes in length, slender, tapering, distinctly 

 serrate, with rounded apex. Maximum 

 length, .78 mm. Described from fifteen 

 types. 



5. henitus is blind and myrmecophilous. I 

 found it at Arlington, Mass., within a single 

 decaying log in swampy soil, along with a 

 colony of ants of the genus Formica. It was 

 common in early June and disappeared in the 

 middle of August of the present year. Easilj' 

 recognized by the terminal antennal seg- 

 ment and absence of eyes. 



5'. benitus is quite distinct from any species 

 yet described but must be placed near 5. fli- 

 catiis Schott, of California.* 

 # 

 Smvfj//nt/y/s sociah's n. sp. 



Lemon yellow, with three broad, longitu- 

 dinal, broken-margined, maroon stripes: a 

 median dorsal and two lateral, the latter con- 

 tinued across the liead ; all connected above 

 the anal tubercle by a broad transverse band. 

 Median stripe often absent and dorsum green- 

 ish. Stripes rarely obsolete or broadening 

 until confluent. Head large, yellow, smooth 

 elongate-ovate in side view, with short, 

 white bristles, especially on the face; oral 

 region, often maroon; a spreading, lobed 

 mark between the bases of the antennae. 

 Eye spots very large, black, connected by 

 a pale, pandurate swelling. Antennae of fe- 

 males a little longer than the head, segments 



* Sch<5tt. Harald. Beitrage zur Kenntniss Kalifornischer 

 Collembola. Bih. Kon. Sven. Vet. Akad. Hand. Bd. 17, 

 MA. IV. No. 8, p. ij.Taf. II. figs. 2-s, 1891. 



