804 CHARLES PAUL ALEXANDER 



orange bodies which are very conspicuous, these possibly being fatty in nature; welts on the 

 abdomen dark brown; in preserved specimens general coloration fading to a dull yellow. 



Form elongate (Plate XX, 57), tapering behind. Surface with a dense, appressed pubes- 

 cence and scattered erect hairs. Prothorax long, narrowed in front, anterior orifice margined 

 with dense, fine pubescence; sides of prothorax with numerous long, erect, pale hairs. 

 Mesothorax and metathorax indistinctly divided into two approximately equal annuli; 

 anterior annulus with a few lateral setae. First abdominal segment short, the setae arranged 

 as follows: dorsal, two small grouped setae near posterior margin, laterad of each of these, 

 but in alinement, a solitary stout seta, proximad of each of these a stout seta, and cephalad 

 of each of these another strong seta, the principal setae of each side thus forming a rough 

 triangle; a long, delicate pleural seta on each side; ventral, two small groups of setae, with 

 an arrangement similar to that of the grouped setae of dorsum. Abdominal segments 2 to 7 

 each indistinctly divided into two annuli by a transverse constriction, the anterior ring about 

 half the'length of the posterior ring and bearing medially a transverse elongate-oval (dorsal) 

 to short-oval (ventral) welt, covered with microscopic points; ventral welts very convex 

 and swollen; pleura with a long seta; posterior ring with setae arranged as described above 

 for first abdominal segment; setae of posterior segments of body longer, but occupying same 

 relative position; small solitary inner seta of dorsal posterior line becoming large and prom- 

 inent on seventh segment; -segment 8 with six powerful setae in alinement on ventral surface, 

 situated at base of gills, two being pleural and four ventral in position; dorsum of segment 

 8 with a rounded median lobe. Gills four, long, delicate, divided into lobes by constrictions 

 (the two caudal lobes, as well as the gills, have taken on a respiratory function). Caudal 

 ventral lobes two (Plate XXI, 68) very long, parallel, with scattered setae arranged as fol- 

 lows: at tips, six or seven; at about two-thirds length, three; at about one-third length, a tuft 

 of from fifteen to twenty long and short setae on lateral and dorsal faces; a small solitary seta, 

 dorsal in position, at base of lobe; a similar bristle on ventral face at about midlength of lobe. 

 Like remainder of body, cauda covered with an abundance of delicate appressed pubescence; 

 on dorsal side, at base of each lobe, a rounded spot, and just inside this a narrow, longitudinal 

 line which is destitute of pubescence. Only dorsal lobe the median one of eighth segment, 

 mentioned above. Spiracles lacking. 



Head capsule (Plate XX, 58) moderate in size. Lateral plates thin, double, inner one the 

 longest, outer one forming mental plate. Dorsal plate broad in front, narrowed behind, 

 posterior margin bluntly notched; in front of this plate, two broad plates, rather widely 

 separated medially, presumably belonging to clypeus. Labrum broad, cephalic margin and 

 ventral face with transverse rows of short hairs. Mentum (Plate XX, 59) conspicuous, deeply 

 split behind but not entirely divided as in the Pediciini; an outer flattened, circular median 

 lobe whose outer face is covered with small, scalelike roughenings; behind (dorsad of) this 

 outer lobe the mentum proper, roughly ' triangular in outline, conspicuous, margin with a 

 broad, blunt, median tooth which is sometimes (Plate XXI, 66) bilobed to form two subequal 

 apical teeth; besides this median tooth, four lateral teeth, the outermost one broad with its 

 lateral angle rounded. Hypopharynx (Plate XXI, 64) forming a ring into which ducts of sali- 

 vary glands open; anterior part, somewhat resembling mentum in shape, a narrow blade 

 with anterior margin having about eight teeth; posterior part a transverse, arcuated band 

 with anterior margin having about twenty teeth. (In the figure, the two parts of the hypo- 



