96 [August 



of the two posterior pairs, and the tibiae, except a blackish line beneath, 

 very pale yellowish-white; tarsi more or less dusky. Abdomen ovate, 

 shining, slightly pubescent, especially at base, with rather deep, scat- 

 tered punctures; first segment convex, rounded at base and contracted 

 at tip, the other segments rather deeply incised at base; each segment 

 with an apical, obscure whitish fascia, bi-undulate on the first segment, 

 with a deep emargination on each side posteriorly; the other fasciae 

 are clouded with dusky posteriorly ; in one specimen the markings are 

 much less developed, the basal segment has only a small spot on each 

 side, the second and third segments have the fasciae deeply emarginated 

 on each side posteriorly, while those on the two following segments are 

 interrupted into three spots on each segment by the emargiuations cut- 

 ting through ; apical segment with a broad continuous band at base, 

 the segment depressed, obtusely rounded or subtruncate at tip; beneath 

 shining, immaculate. Length -tf lines; expanse of wings 8 lines. 



ffab.—Winois, (Dr. Samuel Lewis.) Coll. Ent. Soc. Philad. 



Two $ specimens ; % unknown. Very similar to F. poUtus Say, but 

 the head is differently marked, and the wings are clearer. 



10. PMlanthus dubius, n. sp? 



Black ; sides of face, clypeus except a cuneiform mark on disk, a spot between 

 antennse sometimes connected with a large mark above, collar, tubercles, post- 

 scutellum, tibise and tarsi, spot on each side of first abdominal segment, and 

 narrow emarginated bands on remaining segments, yellow; wings stained with 

 pale fuscous, clearer at base. 



Male. — Shaped and sculptured like P. politus Say. Black, shining, 

 sparsely punctured, and with a thin short white pubescence, more ob- 

 vious on the face and sides of metathorax ; sides of the face, clypeus 

 except a cuneiform mark on the disk, spot between the antennae, some- 

 times connected with a larger, rounded, transverse or broad sublanceo- 

 late mark on the middle of the vertex, a spot or line behind the eyes, 

 a dot on each side just behind the ocelli, and a line on mandibles, all 

 yellow; antennae black, the scape within and a spot on the second. 

 third and fourth joints of the flagellum within, yellowish, the latter 

 fulvous beneath. Thorax : slightly interrupted line on the collar, tu- 

 bercles and a spot behind, tegulae, and a line on postscutellum, yellow. 

 Wings stained with pale fulvo-fuscous, the basal half hyaline ; nervures 

 pale honey-yellow. Legs colored as in P. politus, except that the tarsi 

 are paler. Abdomen shaped, sculptured and marked similar to that 

 of P. politus, but is more pubescent, especially at the apex ; the two 

 apical segments are immaculate, the last obtuse ; beneath piceous-black, 

 immaculate. Length 3J — 4^ lines; expanse of wings 6i — 7* lines. 



