38 S. PRANK AARON. 



Dorypteryx pallida n. sp. Plate IX, figs. 2 and 3.— YeryTpa^e. Mouth 

 ochraceous; mandibles tipped with fuscous. Nasus luteous, sparsely pilose. 

 Maxillary palpi, pale, five jointed, first, second and fourth short, equal, third long, 

 narrow, fifth longer, clubbed. Labial palpi with the last joint truncate. Anten- 

 nae pale, filiform, pilose, twenty-four jointed, the two basal joints larger, the 

 second ochraceous. Crown almost white, occiput with long hairs. Thorax and 

 abdomen pale, the latter with irregular, dull grayish buff, or fiisceous markings, 

 sometimes suffused over almost the entire abdomen, sometimes wanting. Legs 

 silvery, semi-transparent; tibiae and tarsi pilose. Wings hyaline; the margins 

 and veins silvery. Springing from the margins and veins of the wings are many 

 long silvery hairs, evenly set and generally parallel witli each otlier. Length 

 ahout li millim. 



Described from eight examples. I found these insects in the rooms 

 of the Entomological Society, the first three running about the table near 

 a box of Lepidoptera, from which they probably came; (July 25.) 

 another among some old books, (Aug. 30,) and four other,-; running over 

 a package of new books; (Oct. 30.) The single specimen, (x\ug. 30) 

 is without wings, and is very probably the 9 . 



I also found the pupae with the last lot ; they are smaller, and with 

 oval narrow rudimentary wings. When disturbed these little creatures 

 hop quickly and run rapidly. After they are pasted, the abdomens 

 shrink very much, and the markings change in form and often become 

 black. 



Csecilius dellnitus n. sp. Plnte IX, fig. 4.— Pale yellow, sparsely beset 

 with hairs which are thickest and in rows upon the nasus. Antennae about as 

 long as the wings, with ten articles, the basal ones short, the others very long, 

 pale, pilose. Palpi pale. Nasus with indistinct maculosa lines, brown: a long 

 round black spot at ocelli, and two dark brown bands, one from each side of the 

 middle of the occiput, to between the ocelli and the eyes, broadest on the occiput. 

 Eyes prominent, large, an irregular mixture of golden yell<iw and black. Lobes 

 of the thorax shining black, the sutures yellow; sides with two round black spots, 

 one below the base of the fore wings, the other just above the base of the legs. 

 Legs slightly brown at the joints, pilose, at the base of each hair a black point. 

 Abdomen with the sutures narrowly black, and a black ring before the apex. 

 Wings hyaline, with iridescent rellections ; veins brown, sparsely hairy toward 

 base. Pterostigma rounded below, grayer, with many minute black points, from 

 each of which springs a short black hair. At the base of pterostignia a brown 

 spot, and at its apex somewhat brown along the veins. The vein which closes the 

 last posterior elliptical cellule almost touches the second sector, nearly closing the 

 discoidal cellule, which is short and broad. Length to end <if wings about 4 Tuillim. 

 From one specimen in the collection, labelled Pennsylvania. 



Psocns variabilis n. sp. Plate IX, fig. a. — Pale yellow. Antennae 

 shorter than the wings, fuscous, pilose, the two larger basal joints pale. Palpi 

 pale, apical half of last joint fuscous. Nasus faintly lineated with gray and cov- 

 ered with fine silvery hairs which are in rows; two irregular brown spots, which 

 are sometimes confluent, upon upper part of nasus: and a broad, dark brown or 



