610 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



PHTLLOBAENUS DISLOCATUS Say. 



Hopk. U. S. No. 11299c4 ; mature. Species reared ; cast skin and imago preserved. 

 (Figs. 6, 21, 34, 54, 71, 90, 123, 127, 133.) 



Total length of body, about 7 mm. ; extreme width, 1 mm. ; extreme 

 thickness, 1 mm.; anterior width of prothorax, 1 nmi. Mandibles, 

 epistoma, median endocarina of frons, and cerci blackish brown; 

 anterior part of frons, anterior part of ventral side of epicranium, 

 chitinous bands of cardo and stipes brown ocher; rest of head deli- 

 cately chitinized and pale clay yellow ; legs and other delicately chit- 

 inized parts also pale clay yellow ; membranous parts pale lilac where 

 exposed, otherwise whitish. Setae whitish. Frons with short trans- 

 versal impression behind clypeiis, a rather deep pit near center of 

 frons, a flat, very low elevation behind angulus frontalis; posterior 

 end of frons depressed. Mandible about half as long as frons, apex 

 not reaching beyond inner corner of mandibular base ; two mandibular 

 setae. Cerci (the recurved part not counted) one-fifth the length of 

 frons, attached separately, parallel, conical, smooth, with a compara- 

 tively long, pointed, somewhat recurved apex. 



PHYLLOBAENUS MERKELI Horn. 



Hopk. U. S. No. 12259ff ; mature. Species reared ; cast skin and imago preserved. 



Length, about 9 mm.; extreme width, 1* mm.; extreme thickness, 

 nearly 1^ mm. ; anterior width of prothorax, nearly 1^ mm. In every 

 other respect identical with Phyllohaenus dislocatus. 



7. Genus NEICHNEA Wolcott and Chapin {ELLIPOTOMA Spinola; 

 ICHNEA Castelnau). 



Body elongate, vermiform, thoracic and abdominal segments of 

 about same size. Chitinous parts very poorly developed. Membra- 

 nous parts whitish. Head subrectangular, not much wider than long, 

 with slightly curved sides, about as thick as long. Frons somewhat 

 sculptured. Epicranium smooth above and below. Ocelli arranged 

 as in C?iarlessa, rather well developed. Length of biisal, second, and 

 apical antennal joints proportioned as 2:1:1; supplementary joints 

 small. Retinaculum well defined and sharp, no tooth between reti- 

 naculum and apex. Maxilla in proportion to gula as long as 4:5; 

 length of basal, second and apical joints proportioned as 1 : 1 : 2 ; pal- 

 piger with chitinous plate. Submentum and mentum without any 

 chitinization ; stipes labii slightly chitinized; length of basal and 

 apical joints of labial palp proportioned as 1 : 1. Prothorax suboval, 

 slightly wider than long; prothoracic tergal shield absent; protho- 

 racic sternal plate as wide as the distance between the front legs. 

 Legs short and thick. Abdomen with intersegmental membranes 

 about half as large as the segments; dorsal ampullae small, present 

 on second to eighth abdominal segments; postscutellar areas some- 



