262 Rev. F. D. Morice's Notes on Australian Sawjlies. 



classification these are present to the number of 16 ! This 

 fact has long been known, and the larvae of various Perga 

 spp. have been repeatedly described and figured.* It is 

 therefore rather surprising to find Konow on page 11 of 

 his unfinished Monograph (Zeitsch.f. Hym. n. Dipt., Vol. I, 

 p. 169), tabulating six species of Perga as having larvae 

 "with 22 legs"! My "photograph above cited is from 

 one of a number of specimens (preserved in spirit) in B.M., 

 and it will be seen that the character is unmistakable. 

 Konow, I must suppose, had never seen one; but, having 

 made up his mind that Perga belonged to his Subfamily 

 Cimbicini, arrived by deduction from this premiss at the 

 conclusion that its larva must have 22 legs ! 



2. Its posterior tibiae have " ante-apical spines " — a 

 character absent not only in all Cimbicides and Abiides, 

 but in all Palaearctic and Nearctic genera of Konow's 

 Tenthredinidae except certain genera of the Argini. 



3. The structure of its thorax differs obviously in the 

 apical lobation of the scutellum, and also in certain other 

 less conspicuous details. (I do not here dwell on the 

 latter characters, as they are somewhat " critical," and 

 have been dealt with by Mr. Rohwer in his recent classifica- 

 tion of the Suborder in Proc. Ent. Soc. Washington, 1911.) 



4. The neuration is wholly different, Perga has in the 

 fore-wing (a) an undivided radial cell, (b) normally at least 

 four cubital cells, (c) no lanceolate cell — the " humerus " 



being obsolete or undeveloped, and in the hind-wing (d) one 

 cell only (a cubital). 



All these characters (in some of which it agrees with all 

 other Australian and some S. American genera) separate it 

 absolutely from all true Cimbicides and Abiides, and quite 

 outweigh any reason for uniting it with them which might 

 be suggested by the form of its antennae ! 



5. Again, a normal Perga has a reduced aumber of joints 

 in the labial and maxillary palpi, namely, 3 and 1 re- 

 spectively, instead of 1 and 0. which latter is the number 

 in all Cimbicides and Abiides, and, so far as is certainly 

 known, in all Northern Tenthredinidae whatever ! (Xylo- 

 perga, however, does not possess this peculiarity, but has 

 I labial and 6 maxillary palpi (PL XII, Fig. 14) as in the 

 Holarctic genera.) But it is not certain what inferences 



* Cf. Scott's description and figures in Proc. Zool. Soc, L859, 

 p. 211, and PI. IAII; also those of Davis in Entomologist, Vol. I. 

 p, 89, and of Froggatt in Australian Insects, p. 72 and PL X, etc. 



