90 ' [August 



the whole length of the segment; third, fourth and fifth segments each 

 with a narrow subapical yellow band, broader on the sides, more or less 

 deeply emarginated on each side anteriorly, and very slightly inter- 

 rupted in the middle; apical segment depressed, rounded at tip, smooth 

 and shining, without apparent punctures; venter piceous-black, shining, 

 immaculate. Length 7 lines; expanse of wings 11 lines. 



Male. — Resembles the female in general shape and markings ; the 

 head is not so broad, scarcely wider than the thorax, and clothed with 

 black pubescence ; the eyes are more approximated on the vertex and 

 the front not so depressed; the clypeus has a triangular black mark on 

 the middle anteriorly, and together with the longitudinal mark on the 

 side of the face and the spot between the antennae, assumes a shape not 

 unlike a W; the spot between the antennae is sometimes confluent with 

 a large suborbicular spot on the vertex ; the spot on each side of the 

 cheek is situated rather lower down than in the female; the appressed 

 lateral tuft of the clypeus is fulvous; the mandibles are entirely black, 

 polished, simple, and acute at tip ; the flagellum of the antennae is 

 gradually narrowed towards the base, and the second joint is cylindri- 

 cal and not clavate; the scape and four or five basal joints of the flagel- 

 lum are yellow, black behind. Thorax, wings and legs are same as in 

 the female, except that the tegulge are almost entirely yellow, and the 

 femora are more blackish. Abdomen narrower, the markings are much 

 the same, except that the first segment is generally immaculate, the 

 large maculae on the second are more transverse and approximated on 

 the middle of the segment, while the fasciae on the three following seg- 

 ments are sometimes entire, and sometimes much narrowed and inter- 

 rupted into narrow lines, by the emarginations cutting through ; the 

 sixth segment has two small spots on the middle, sometimes obsolete or 

 wanting; the whole abdomen is clothed with a black pubescence, short 

 and sparse above, long and rather dense beneath, especially towards 

 the tip. Length 4| — 6J lines; expanse of wings 9 — 11 lines. 



H(il>. — Massachusetts. (Mr. James Ridings and Mr. F. Stratton.) 

 (Vll. Eut. 8oo. Philad. 



Six 9 . nineteen % specimens. The female of this species is shaped 

 somewhat like that of P. frlijidm^ Smith, but the markings are difl"er- 

 ent, and may be at once distinguished by the large ovate macula on 

 each side of the second abdominal segment. 



It gives me pleasure to dedicate this fine species to my much es- 

 teemed friend. Mr. Francis (I. Sanborn, of Boston, Mass., a zealous 

 and valuable t^ntomologist. 



