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LVII. PLATYSPHINX gen. nov.— Typns : constriqilis. 



Amhiibj.r Walker («n« id., 18j6), Proc. Xat. Hist. Soc. Glasgou- i. p. 328 (18G9). 

 Bas'iam, Mahille {non Walker, 1866), Bull. Soc. Zoo!. France ii. p. 491 (1878). 

 Brnchygloi'sa ?, id., Ann. ."Snc. Enl. Frnncc p. i?^ (1870). 



J?. TongiiP ratlipr stout, but short. Palpiis smaller in ? than in d , joint 

 not qnite open. A tuft of long hair-scales behind the eye, hanging over the lower 

 part of same. Antenna of ? thin, cylindrical, not grooved, seriated ciliae very 

 slightly prolonged : of S strongly compressed, deeply grooved : end-segment short. 

 Abdominal tergites spinose all over, the s])ination more tawny, stronger, and denser 

 at the apical margins. Tibiae .^pi/w.^i": foretibia nearly as long ns tarsus; spurs 

 short, (i/if pair to hindtibia : jmlvillus and paronychinm present. Distal margin 

 of wings entire ; apex of forewing little produced, acute, hinder angle very obtuse 

 in ?, less so in t? ; D" of hindwing oblique, about twice as long as D\ lower angle 

 of cell more or less acute, f 'lasper and eighth tergite without friction-scales. 



Early stages not known : the larva most probably spiny. 



Hall. West and East Africn, not yet known from German and British East 

 Africa. 



A derivation from a form similar to Pseite/oclnm's posft'ca, differing in the 

 shorter tongue, the longer tibiae, the absence of the proximal pair of hindtibial 

 spurs, the not-prolonged seriated ciliae of the ? -antenna, etc. 



The four species resemble one another rather closely in colour ; their dis- 

 crimination requires some care. 



Key to the species : 



II. Hindwing below shaded with conspicuous 



white scaling on disc .... 18;"). P. coih^tric/Ui-'i. 



Hindwing below without white scaling on disc . Ii. 



fi. Forewing jiractically without speckles . . ISS. T'. piiihilia. 



Forewing witli numerous speckles . . . <. 

 f. Forewing below with large red patches or u 



red band behind coll .... l>*ii. /'. s^tiymaticu. 

 Forewing below without either large red 



])atches ur a red liand liehind ceil . 1.^7. /'. iilniUia. 



1>.">. Platysphinx constrigilis. 



Anihiili,.r con^lriffllU Walker, I'lOc. Xtil. Ilhl. So,: lih.^ymr i. p. 328. n. ■-> (1809) (Conijo): 



Ki'rby, Oil. lej). Het. i. p. 07C. n. 29 (1892). 

 Amlubjx'i cimntngUh. Bntler, Ti-nnn. ZooL Snc. Lnml. ix. p. 682. n. 12 (1897). 



S ? . This is the most generalised of the species of this genus. 



Wings ; uypermle, speckles small, those of forewing minute. Forewing : 



a straight, narrow, oblique Hue 2 or 3 mm. proximally of M-, continuous Irom costal 

 to inner margin, another line across ape.x of cell appearing as a direct prolongatiou 

 of a line along R", an isolated Inniform line between M and (SAP) iiro.^imally of 

 hase if J[' ; three discal lines, the inner two geminate, both obsolete between 

 R- and M^ reapjic.aring between M' and M- as two halfmoons, of which the 

 jjroximal one is very faint ; the third line consisting of arches, produced distad 

 upon the veins, arch R' — M' much more proximal than the others ; a short brown 



