452 AMERICAN HYMENOPTERA. 



Apathus " Cresson, Trans. Amer. Ent. Soc, IV, 1872, p. 



284. 

 " laboriosjis Cresson, Trans. Amer. Ent. Soc, VII, 1879, p. 230 

 (Catal.). 

 citrinus Cresson, Trans. Amer. Ent. Soc, VII, 1879, p. 230 

 (Catal.). 



" " var. conlistius Cresson, Trans. Amer. Ent. Soc, 



VII, 1879, p. 230 (Catal.). 

 " laboriostis Provancher, Natural. Canad., XIII, 1882, p. 268, n. 



1, 9. 

 " citrinus Provancher, Natural. Canad., XIII, 1882, p. 269, n. 4, 



(?. 

 " laboriosus Provancher, Faun. Ent. Can. Hym., 1883, p. 736, 



n. 1, 9. 

 " citrinus Provancher, Faun. Ent. Can. Hym., 1883, p. 737, n. 

 4, (?. 

 Cresson, Syn. Hym. No. Amer., 1887, p. 307 

 (Catal.). 

 " " var. contig-uus Cresson, Syn. Hym. No. Amer., 1887, 



p. 307 (Catal.). 

 " laboriosus Cresson, Syn. Hym. No. Amer., 1887, p. 307 



(Catal.). 

 '• " Provancher, Addit. Faun. Canad. Hymen., 1888, 



p. 342, 9, and 343, cf. 

 " citrinus Provancher, Addit. Faun. Canad. Hymen., 1888, p. 

 342, d^. 

 Psithyrus citrinus Ant. Handlirsch, Ann. Naturh. Hofmus. Wien., Ill, 

 1888, p. 248; T. 10, F. 16. 

 " Dalla Torre, Cat. Hym., X, 1896, p. 568 (Catal.). 

 " " var. contiguus Dalla Torre, Cat. Hym., X, 1896, p. 



568. 

 laboriosus Dalla Torre, Cat. Hym., X, 1896, p. 569 (Catal.). 



Robertson, Trans. Amer. Ent. Soc, XXIX, 1903, 



p. 178, c? and 9 . 

 Howard, Insect Book, 1904, Plate II, fig. 22, 9 . 

 " citrinus Howard, Insect Book, 1904, Plate II, fig. 23, cf. 



laboriosus Lovell, Ent. News, XVIII, May, 1907, pp. 199-200. 

 Swenk, Ent. News, XVIII, July, 1907, p. 297, n. 2. 

 " " Fletcher and Gibson, Can. Ent. Rec (Ann. Rep't 



Ent. Soc. Ont.), 1907, p. 17. 



Types. — Smith's type of citrinus, so Col. C. T. Bingham 

 wrote me, is in the collection of the British Museum. At 

 least a part of the specimens, on which Cresson based his 

 description of contiguus, are in the collection of the American 

 Entomological Society. 



