THE CANADIAN ENTOMOLOGIST. 121 



segment twice as long as broad, naked; second three or four times as 

 long, knotty, hairy towards apex ; third purple, four or five times the 

 basal, knotted, hairy except basally, obliquely dilated but squarely 

 articulated at apex; terminal segment purple, half again the basal, 

 lanceolate, moderately long, white, hairy. Body regular, elongate-oval in 

 dorsal outline ; anterior dorsum naked, translucent orange-ochraceous 

 with a broad and long median shading of green due to chlorophyll in 

 the stomach (lateral, convulsive movements of which are easily observ- 

 able in living specimens); posterior dorsum and sides orange-rufous to 

 dark ferruginous, often with a tinge of maroon, the general colour being 

 due to the combined effect of minute orange-ochraceous and ferruginous 

 mottlings ; posterior dorsum with short white bristles upon minute, 

 round, orange-ochraceous spots; anal tubercle hardly visible from above, 

 bristly. Ventral surface pale yellow, with three pairs of smooth, buff-yellow 

 tubercles : a small, rounded tubercle on either side the manubrium ; a 

 large, oval, oblique one either side the middle ; a narrow, oblique pair 

 anterior to these ; ventral tube pale orange-ochraceous, transparent, buff- 

 yellow inside at base ; tube plus protruded filaments one-fourth longer 

 than the antennae. Legs slender ; femur with sparse, short bristles ; tibia 

 paler distally, stout spiny at moderate intervals ; claws white, very stout ; 

 superior claw of almost uniform width, little curved towards the 

 mucronate apex, six toothed : inner edge with a tooth at the middle, and 

 another midway between it and the apex; two pairs of lateral teeth, 

 similarly placed near the outer edge ; inferior claw two-thirds as long as 

 the other, long triangular, tipped with a short bristle from a stout, 

 straight midrib ; inner edge sinuate or straight, with a short bristle one- 

 third from base. Furcula short, reaching to ventral tube ; manubrium 

 extending beyond anal tubercle, sparsely hairy ; dentes twice as long, 

 stout, pale orange-rufous, with short, lateral bristles, and several longer, 

 ventral bristles at regular intervals ; mucrones white, one-fourth dentes in 

 length, oblong, finely serrate beneath, apex rounded. 



Maximum length, 1.6 mm. Described from over fifty specimens. 



This species occurred abundantly with P. vittatiis at the same time 

 and place, feeding upon algse on the outside of flowerpots, and, curiously, 

 having the exact colour of the latter. 



Types of the above species have been given to the Museum of 

 Comparative Zoology at Cambridge, Mass. 



