( (i4 ) 



develojiiuent id' offslioofs tVoiii Dairmma, Atrens, Chlaeiiogramma, etc., etc., but 

 that tlu'st' jrt'in'ra arc (lerivatioiis IVom a common .stock similar to Protoparre, 

 ])ossesi4iiifr a lonir toiiuiic, a ]]nlvilln.'i, a paroiiycliiiim, a frenulum, a micUarsal comli 

 and unarmed tibiae. The imlvillus disajijjcars already among I'rotopurcc. The 

 loss (ir reduction of one or the other of these organs is accompanied in most cases 

 by tiie appearance of spines on the tibiae, beginning with the foretibia. With 

 the reduction of tlie tongui^ goes hand in hand a shortening of the tongue-case 

 of the chrysalis, the iirojccting " nose " disajipearing finally. In the present group 

 the ])ulvillns is the first to be lost, and then the jiaroiiychiuni ; while in the tribe 

 S/i/ii/K/ulirac, the forms with a short terminal antennal segment, the paronychium 

 is lost in one genus, while the j)ulvillus is still there. 



The distinguishing characters of the sjiecies of Prolopairc are often not very 

 pronounced, csjierially as regards the ]iattern of the wings and body. In several 

 instances we have not been able to separate two species with certainty except by 

 the help of the genital armature. On the other hand there are species, quite 

 distinct in patteru and certainly not forms of the same species, which show no 

 dift'erences in the se.xual organs. The oi)inion held by many entomologists that 

 diti'ereut species are always different in the genital armature is cjuite erroneous. 

 The best instance to repudiate that assumjition — it is, of course, nothing else but 

 an assumptiim — is that of ('lihiciioi/rammii janmiiieariim and Protojxirce /{orextan, 

 which, though generically distinct, have nevertheless exactly the same genital 

 armature in both sexes. 



Key to the species : 



a. ( 'law-segment without jiulvillus . . b. 



„ with „ . . q. 



b. Forewing without complete lines, for 



the greater jiart clayish tawny 



ochraceous like thorax . . 49. P. ochus. 



Forewing without transverse lines 

 except a postdiscal one ; for the 

 greater part greyish white . . 45. P. lem-optera. 



Forewing with numerous transverse 

 lines ; greyish brown, yellowish, 

 or olive ...... c. 



c. Second abdominal segment without 



yellow side-patch . . . iil. l\ .■ihiarfi. 



Secondabdominal segment with yellow 



side-patch ......(/. 



(/. Abdomen with more than three 



yellow side-jjatches . . . . e. 

 Abdomen with three yellow side- 



Jiatches ...... iii. 



Abdomen without yellow side-jiatches . i: 

 e. AVliite spots of fringe of forewing mere 



dots, very much smaller than the 



lirowu portions of the fringe ; 



thorax olive, or olive-green ; fore- 

 tibia not armed . . . • ./ 



