Vol. XXVlii] ENTOMOLOGICAL NEWS. 303 



cheek behind; facial foveae oblique; vertex shining but well punctured; 

 rlagellum clear ferruginous beneath except at base, antennae otherwise 

 nearly black. Mesothorax and scutellum shining and sparsely punc- 

 tured, metathorax dull; cream-colored markings consisting of inter- 

 rupted line on collar, ends of tubercles, spot behind tubercles, spot at 

 each anterior corner of scutellum, band on postscutellum, spots on 

 knees (extending to stripes on anterior femora), and bands on abdom- 

 inal segments 1-6, on first segment reduced to a pyriform mark on eacli 

 side, on second and third broadly interrupted, on fourth narrowly in- 

 terrupted, on fifth and sixth hardly more than constricted; tegulae 

 clear fulvous; wings yellowish, dusky apically, stigma amber-color; 

 apical plate of abdomen broadly truncate, the truncation slightly ex- 

 cavated. (Bruner 59.) 



$. Length about 10 mm.; differing from the male thus: Head or- 

 dinary, though broader than long; mandibles black, with a ferruginous 

 patch; face black, except for a pair of large quadrate patches, broader 

 than long, taking in the dog-ear marks and the space between these 

 and the orbits; mesothorax and scutellum rather densely punctured; 

 bands on first two abdominal segments rather broadly interrupted, on 

 third narrowly, on fourth very narrowly, on fifth entire; fringe at 

 end of abdomen black; spur of middle tibia as long as basitarsus, re- 

 motely short-pectinate. (Bruner 60.) 



The sexual difference in the sculpture of the thorax is paral- 

 lel with that observed in P. pliilanthoidcs Gerst. 



Related to P. rubripcs Friese, from which it is known by the 

 much darker antennae, spotted scutellum, and the large light 

 patches on face of female. According to the description, P. 

 rufipcs Holmbg. appears to be very similiar, differing by the 

 color of the flagellum and the form of the face-markings. 

 Schrottky states that rufipcs is a variety of P. picta, which P. 

 pachycephala certainly is not. 



Physiographic Divisions of the United States. 



Entomologists studying geographical distribution will find useful a 

 monograph by Nevin M. Fenneman, under the above title, forming 

 pages 19-98 of volume VI of the Annals of the Association of Ameri- 

 ,1111 Ccof/niphers. It attempts "to divide the United States into na- 

 tural or physical units which should be as nearly as possible homo- 

 geneous with respect to certain criteria All orders of divisions 



rest ultimately on existing differences in topography and elevation. 

 15ut the differences considered are those which pertain to physiographic 

 types and not merely superficial appearance." It is accompanied by a 

 preliminary map of the United States 42.5 x 17 inches. Copies may be 

 purchased for 26 cents from the Secretary and Editor of the Associa- 

 tion, Prof. Richard E. Dodge, Washington, Connecticut. 



