176 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



terioiiy; urogomphal prongs subequal, or inner prongs (ipr) longer 

 than outer prongs, outer prongs (opr) with bluntly rounded tips; 

 prominent transverse rugae on abdominal mediotergites (fig. 35, e), 

 especially on third, fourth, and fifth segments. 



Mature larvae usually measure 16 to 19 mm. in length. Dorsum 

 dark brown (cucuUatus) or yellowish brown. Ninth abdominal seg- 

 ment (fig. 35, c, f) with (cucuUatus) or without conspicuous, large 

 pits on dorsum, with 3 prominent "teeth" (usually blunt) on each 

 lateral margin of dorsum, and with distance between caudal notch 

 and pleural area approximating one-ninth to one-sixth total length 

 of segment, exclusive of urogomphi. Frontoclypeal area truncate 

 posteriorly. Without setae on ventral aspect of basal segment of labial 

 palpus. Up to 9 (usually 6 or 7) spinelike setae on each episternum 

 of mesothorax and metathorax. Abdominal mediotergites (fig. 35, e) 

 with impressions reaching to middorsal suture on some segments; 

 transverse rugae on anterior segments give place to circular pits on 

 posterior segments ; and usually 5 or 6 prominent setae in posterior 

 transverse row. 



Material used in the study of the group. — As stated above, reared 

 material was available for all three species. All the reared adults were 

 identified by W. J. Brown, Ottawa. 



A. cucidlatus (Say) : The 12 specimens examined were collected 

 in Minnesota (i), Illinois (6), Mississippi (i), and Pennsylvania 

 (4). In four instances larval skins were preserved with reared adults, 

 but only one of the available whole larvae was directly associated with 

 a reared specimen, through being collected at the same time and 

 place. Material for which the reared adults are available is detailed 

 below : 



I ; St. Paul, Minn.; adult emerged June 4, 1933; R. Glen. (C.N.C.) 



i; Hummelstown, Pa.; (no date); J. N. Knull. (U.S.N.M.) 



2; Cornwells, Pa.; April 1927; i reared; C. A. Thomas. (Pa.C.) 



i; Crowell Woods, Pa.; adult emerged June 25, 1930; C. A. Thomas. (Pa.C.) 



A. scapularis (Say) : Nine specimens were examined. These were 

 from Illinois (3), Tennessee (i), Maryland (i), Pennsylvania (2), 

 and Delaware (2). The larval skins of 3 reared specimens were 

 studied, but none of the available whole larvae were directly asso- 

 ciated with the reared material, being from different localities. Ma- 

 terial for which the reared adults are known to be available is listed 

 below : 



1; Reelfoot, Tenn. ; adult emerged May 21, 1936; A. P. Arnason. (C.N.C.) 

 2; Centerville, Del.; Apr. 12, 1930; i adult emerged June 21, 1930, other speci- 

 men pupated June 10, 1930; C. A. Thomas. (Pa.C.) 



