I98 KINCAID [376] 



broader at base than long. Clypeus tridentate, the teeth sharp and 

 equal. Mandibles bidentate, the inferior tooth considerably shorter 

 than apical, both teeth sharp at apex. Antennae three-jointed, the 

 joints successively shorter. Maxillae reaching to tip of mandibles; 

 stipes three times as long as broad; maxillary palpi one-fourth the 

 length of stipes, three-jointed, the joints gradually diminishing in size. 

 Mentum four times as long as broad, half as broad as stipes, not nar- 

 rowed behind, anterior margin rounded ; labial palpi small, two-jointed, 

 conical. 



Pronotum smooth, shining, longer than broad, slightly narrowed in 

 front, anterior margin straight, sides curved downward, but not mar- 

 gined. Mesonotum and metanotum transverse, twice as broad as long. 

 Legs short, thickly setate. 



Abdominal segments from first to eighth broader than long, sub- 

 equal ; dorsal scutes punctured and with numerous short transverse 

 striae, sides not margined; impressed median line strongly developed. 

 Ninth abdominal segment longer than broad at base, tapering slightly, 

 anterior angles strongly punctured ; posterior emargination broad, 

 transversely oval ; lateral margins with a strongly raised ridge bearing 

 externally three equidistant rounded tubercles, the proximal one the 

 smallest, the second and third successively larger ; central area flat- 

 tened, not deeply depressed, impunctate, with light irregular ridges 

 passing from the sides towards the center, a shallow median groove ex- 

 tending from the posterior margin to the middle ; cerci strong, bifur- 

 cated, the terminal projection sharp, slender, curving strongly inward, 

 the lateral projection shorter, stouter, at right angles to the terminal 

 process. 



Described from larvae found beneath driftwood along the seashore 

 at Kukak Bay, Alaska, July 2, 1899. 



No American representative of this genus has hitherto been reared. 

 The larvae described above resemble closely those of Cryptohypnus 

 riparius, described by Schiodte from Europe. 



LEPTALIA MACILENTA Mann. 



[Plate XXV, figs. 8-12.] 



Larva white, except head and pronotum, which are of a yellowish 

 tinge; extreme anterior margin of the front and mandibles brown; 

 form elongate, cylindrical, broadest at the pronotum, gradually nar- 

 rowing to the third abdominal segment, fourth to sixth segments of 

 about equal diameter, seventh and eighth slightly swollen and longer, 

 ninth short, broadly rounded posteriorly. Length 15 mm. 



