>632 PROCEEDINGS OF THE ACADEMY OF [NoV., 



<5ostal cross-vein in fore wings, and the apical marks of fore wings. 

 The wings are long, dark brown; there is a transverse band of white 

 in stigmal region, a crescentic white mark over tip of wing, and pale 

 ;spots on outer margin in the cells. Between the apical and stigmal 

 marks is a large patch of golden hair, which when rubbed shows 

 hyaline streaks in the bases of several apical cells. Expanse 26 mm. 



From Mallali, British Guiana, March (Parish). 

 Phylloicus brevior n. sp. PI. XXVIII, figs. 2, 4. 



Body yellowish, with yellow hairs; anterior part of the thorax 

 blackish, and tip of abdomen dark; antennae black-haired, and 

 sometimes a black spot over base of each antenna; a row of black 

 Jiairs each side of face under the antennse; legs pale, most of fore 

 and mid tarsi, all of hind tarsi and part of tibia black, three spurs 

 on hind tibia, four on mid tibia. Wings nearly evenly dark reddish 

 brown, darker on costal area and on apex; hind wings also dark, 

 more blackish. Fore wings with venation much like that of P. 

 ■abdominalis — that is, the first fork extends one-half way back on 

 ■discal cell ; in the hind wings, however, the apical forks are longer, 

 and there is no closed median cell; the male genitalia are exposed. 

 Expanse 19 mm. 



From Bartica, British Guiana, December (Parish). 



F 

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Explanation of Plate XXVIII. 



g. 1. — Neoperla holivari, ventral plate. 



g. 2. — Phylloicus brevior, genitalia of male. 



g. 3. — Isoperla lexana, ventral plate. 



g. 4. — Phylloicus brevior, tip of hind wing. 



g. 5. — Perln xcnocia, side and dorsal view cf genitaliia. 



g. 6. — Acraioleon flavum, tarsus I. 



g. 7. — Callibcetis semicostata, clasper. 



g. 8. — Lepiophlebia assimilis, clasper and last dorsal segment. 



g. 9. — Macronema picleli, tip of fore wing. 



g. 10. — Neoperla pkdonis, ventral plate. 



g. 11. — Ephemerella vernalis, clasper. 



g. 12. — Perla xenocia, ventral plate. 



g. 13. — Hexagenia callineura, part of wing. 



g. 14. — Habrophlebia joco.sa, clasper. 



g. 15. — Ccecilius posticus, fore wing. 



g. 16. — Perln georgiana, ventral plate. 



g. 17. — Perlodcs dossotice, ventral plate. 



g. 18. — Psocus stigmosalis, fore wing. 



g. 19. — Perlodes tibialis, ventral plate. 



g. 20. — Pericli/dus, anal ar(>a fore wing. 



g. 21. — Indoleoii, anal area fore wing. 



g. 22. — (Jleitoleoii, anal area fore wing. 



g. 23.—Distoleon, anal area fore wing. 



g. 24. — Mtjrmclcon, anal area fore wing. 



g. 25. — Paraxjlcnurus, tarsus I. 



g. 26. — Perlodes signala Hagen, venter. 



