618 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 5T. 



This genus is in many respects closely related to genera as 

 Neichnea and Phyllohaenus. 



ORTHOPLEURA DAMICORNIS Fabricius. 



Hopk. U. S. No. 10369rf; mature. Species reared; cast skin and imago preserved. 

 (Figs. 12, 26, 39, 59. 77, 99, lOS, 131.) 



Total length of body, lOmni.; extreme width about 2|- mm.; ex- 

 treme thickness, 2^ mm. ; anterior width of prothorax, about 1 mm. 

 Mandible, epistoma, endocarina of f rons, tarsi, and cerci pale brown ; 

 remainder of headcapsule, antennal, maxillary, labial chitinizations 

 and legs pale clay yellowish; membranous parts of body whitish. 

 Setae whitish. Mandible with sharp retinaculum; tooth between 

 retinaculum and apex about as large and sharp as retinaculum ; two 

 thin mandibular setae. Cerci, without consideration of the recurved 

 part, one-ninth the length of frons. 



12. Genus MONOPHYLLA Spinola. 



Body vermiform with short thoracic segments and prolonged ab- 

 dominal segments ; long intersegmental membranes ; ninth abdominal 

 segment rather small, subcrescentif orm ; no dorsal ampullae, later- 

 ally with protuberant lobes, ventrally rounded. Chitinous parts 

 moderately developed. Membranous parts whitish. Setae thin; 

 numerous on chitinous, scarce on membranous parts. Head capsule 

 small, subtriangular with curved sides. Frons sculptured; in one 

 species with an unpaired median protuberance. Epicranium rather 

 smooth with well-marked pits for the setae; anterior margin of 

 hypostoma slightly concave. Ocellus moderately developed, situated 

 just behind ventrolateral part of antennal ring. Length of basal, 

 second, and apical antennal joints as 3:1:2; supplementary joint 

 small. Mandible about half as long as frontal suture, a trifle longer 

 than wide, rather stump; retinaculum well developed, situated just 

 above the middle of the inner margin; tooth present above retinac- 

 ulum (fig. 27). Maxilla with low, bandlike chitinization at the base 

 of cardo and stipes. Length of basal, second and apical joints of 

 maxillary palpus proportioned as 2:1:2; palpiger with chitinous 

 plate. Gula as long as frons; nearly twice as long as the maxilla. 

 Submentum and mentum poorly chitinized. Stipes labii moderately 

 chitinized ; length of basal and apical joints of labial palpus propor- 

 tioned about as 1:2. Prothorax transversely subrectangular, about 

 three times as wide as long, hardly as wide but longer than the fol- 

 lowing thoracic segment; prothoracic shield poorly developed; 

 sternal plate large, rectangular, longer than wide, thinly chitinized. 

 Meso- and metathorax without dorsal chitinizations; hypopleural 

 chitinized support for the legs present, but not strong. Legs short, 

 moderately chitinized. Abdomen with intersegmental membranes 



