52 PROC. ENT. SOC. WASH., VOL. 23, NO. 3, MAR., 1921 



A. Respiratory plate of spiracles surrounds the major part of bulla (R and 

 B fig. 1). Legs with covering of fine hair. 

 [By these two characters the Copridini sensu Schiodte 



are excluded.] 



1. Maxilla with both malae ( = inner and outer lobes) completely fused 

 (fig. 6). Anal opening transverse and terminal (fig. 15). 



[By these characters the Sericini sensu Schiodte are 



excluded.] 



b. 1 Scissorial portion of mandible depressed; apically obliquely truncate with 

 terminal angle acute, posterior angle obtuse and by a short incision sepa- 

 rated from a small tooth (figs. 8, 11). Labrum with lateral margins of the 

 ventral side flattened and transversely striate (fig. 7). Length of antenna 

 equal to length of head; subapical antennal joint distally and internally 

 produced into a conical and pointed, incurved appendix. Claws (abbrevi- 

 ated expression for clawshaped tarsi) slender, subulate. 



[By this combination of characters the Cetoniini and the 

 Dynastiini* sensu Schiodte are excluded.] 



f. Stridulating area of mandible, placed in the manducatorial portion, 

 oblong, transversely ribbed with very fine and densely set ridges (figs. 4 

 and 13). Molar structure of right mandible with bicarinate crown (cr 1, cr 

 2 fig. 24). Maxilla with interior mala ( = inner lobe = lacinia) bidentate 

 and with [about] six acute, recurved Stridulating teeth (figs. 14,17 and 21). 

 Anal valvules not well defined, anal slit crescent shaped (figs. 15, 23). 

 Abdomen clavate-cylindrical. 



[By this series of characters the Rutelini are separated 



from the Melolonthini' 1 ' sensu Schiodte.] 

 The two forms described by Schiodte as typical Rutelini 

 larvae on which his characterization of this tribe is based are 



1 Under "a" Schiodte characterizes the Dynastiini and Cetoniini. 



2 The Dynastiine larva of Cyclocephala immaculata Olivier is mentioned by 

 John J. Davis as one of those white grubs, which most likely could be mistaken 

 for Popillia japonica. (John J. Davis: The green Japanese beetle, Circular 

 No. 30, New Jersey Dept. of Agric., 1920, p. 20, fig. 11.) 



3 Some Melolonthine larvae of the genus Phyllophaga ( = Lachnosterna), as P. 

 hirticula Knoch and P. tristis Fabricius, are mentioned by John J. Davis as likely 

 to be mistaken for Popillia japonica (I.e. in footnote 3). As another larva which 

 can be mistaken for Popillia japonica, John J. Davis also mentions (I.e.) Macro- 

 dactylus subspinosus Fabricius. According to the character of the adult beetle, 

 the genus Macrodact\lus is placed among the Melolonthini. The larva, however, 

 only approaches this tribe but can not be placed in it, differing in the following 

 essential characters: 1. No Stridulating area on mandible, no Stridulating teeth 

 on maxilla (the Melolonthini having a transverse Stridulating mandibular area 

 formed by irregularly distributed granules and twelve maxillary teeth). 2. 

 Mandibular molar structure indistinctly bicarinate (the Melolonthini having 

 tricarinate mola). 3. All claws of equal size (the Melolonthini have third pair 

 abruptly abbreviated). 



