120 THE CANADIAN ENTOMOLOGIST. 



white ; superior claw long, tapering, rather straight, six toothed ; inner 

 edge with two prominent teeth at about equal intervals ; two more on 

 both sides near the outer edge, dividing it into thirds ; inferior claw half 

 as long as the other, straight, tapering, bearing subapically a slender 

 bristle longer than the claw, also a tooth upon a swelling on the inner 

 edge near the base. Furcula almost reaching the head ; manubrium 

 stout, purple ; dentes twice as long, slender^ pale lilac, each with long 

 white bristles on either side, and a single, extra long ventral, subapical 

 bristle ; mucrones white, less than one-third the dentes, narrowly elliptical, 

 ventral concavity shallow, with distinctly serrate edges, apex clearly 

 emarginate, having a median, rounded quadrate notch between two 

 rounded teeth. 



Maximum length, 3.3 mm. Described from over fifty specimens. 



This species was found abundantly in February and March of this 

 year, in a greenhouse at Cambridge, Mass., upon wet, decaying wood, and 

 upon the outside of alga-coated flowerpots, especially in warm, moist 

 and shaded situations. 



P. vittatus is closely allied to P. marnioratus, Pack. I have 

 examined the types of the latter species which have shrivelled and lost 

 colour, yet show distinct, structural differences from P. vittatus, especially 

 in the claws and mucrones. P. marmoratus has a longer, oblong 

 mucro, not emarginate, but terminating in a distinct, rounded lobe ; the 

 distal spines of the dentes are clearly barbellate ; claws shorter and 

 stouter ; the superior claw has four teeth much more obscure than the 

 six of vittattcs : an evident tooth on the middle of the inside, a second, 

 obscure, midway towards the apex, and a pair of small lateral teeth near 

 the outer edge, one-third from the apex ; the inferior claw has a short, 

 apical bristle, and is less dilated basally than in P. vittatus. 



This species is easily recognized by the broad white head band, the 

 sagittate mark, the three median dorsal streaks, and the brilliant white 

 spots on the sides of the abdomen. 



Papirius opalitius, n. sp. 



General colour orange-rufous or ferruginous. Head, first two 

 antennal segments, anal tubercle, and legs pale orange-ochraceous. 

 Head with a few short bristles on front; vertex almost naked, swollen 

 dorsally; eye spots black, often quadrate. Antennae shorter than the 

 body, from three-quarters to one-half as long, according to age; basal 



