46 SMITI-ISONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



Largest larva examined measured 23 mm. in length and 3.25 mm. 

 in breadth without being fully distended. Furcal pits (prothorax) 

 deeper than in acripennis. Transverse branch of impressions on 

 first eight abdominal segments usually shorter than in aeripennis. 

 Urogomphi (ur, fig. 15, a; fig. 15, b, c) and prongs exceedingly vari- 

 able in size, shape, and presence of turbercles, but usually as described 

 below^. Inner prong (ipr) slightly more slender than outer prong, 

 projecting caudad and slightly mediad, with rather long, sharp, up- 

 turned, horny tip ; prominent tubercle (sometimes absent) on postero- 

 ventral aspect, usually not very conspicuous from dorsal view ; several 

 small setae and 2 or 3 prominent hairs ventrally, i of which arises 

 near base of tubercle ; i prominent seta on posterodorsal surface, 

 anterad to tubercle. Outer prong (opr) projecting dorsad, usually 

 slightly caudad, with sharp, horny tip inclining Ijackward (sometimes 

 straight) ; conspicuous sharp, horny, setiferous tubercle (tub) later- 

 ally just below base of prong ; i prominent seta on anterolateral aspect, 

 several smaller setae around distal part of prong. Caudal notch (en) 

 highly variable, usually U-shaped, about as long as broad, narrower 

 posteriorly ; sometimes much wider than long, or subovate and longer 

 than wide. 



Material used in study. — In all, 27 specimens were examined, in- 

 cluding the larval exuviae of 4 specimens reared to adults. All ma- 

 terial was from the State of Washington and is stored in the Canadian 

 national collection and the U. S. National Museum. The reared 

 adults were identified by both M. C. Lane, Walla Walla, Wash., and 

 W. J. Brown, Ottawa, Ontario. Whole larvae from Ritzville were 

 examined, but these were collected on a different occasion from those 

 that were reared to adults as listed below. 



4; Ritzville, Wash.; all reared to adults; M. C. Lane. (U.S.N.M. : Ritzville 

 Laboratory No. 20, subnumbers -41A5, -42E2, -42F1, -42F6.) 



LUDIUS AENEUS (Linnaeus) 



Elatcr aeneus Linnaeus, S3'stema Naturae, ed. 10, vol. i, p. 406, 1758. 

 Selatosomus aeneus (Linnaeus), Stephens, Illustrations of British entomology, 



Mandibulata, vol. 3, p. 268, 1830. 

 Ludius aeneus (Linnaeus), Boisduval and Lacordaire, Faune Entomologique 



des Environs de Paris, vol. i, p. 666, 1835. 

 Aphotistus aeneus (Linnaeus), Kirby, in Richardson's Fauna Boreali- Americana, 



vol. 4, p. 149, 1837. 

 Corymbites (Selatosomus) aeneus (Linnaeus), Schenkling, Coleopt. Cat. (ed. 



Junk), vol. 2, pt. 88, p. 370, 1927. 



