Insects. 2689 





descriptions assist us but little in determining their homology * The 

 dogface consists of eight pieces : drawing a --al long— 

 line thronghout Us extent, it will intersect fonr sections, all of them 

 d «marhed and eonspicnons. In such a case there seen, , M. e 

 choice as to nomenclatnre : we are almost reduced to the Mcessrty ot 

 al tag them pnescutum, scutum, scutel.nm and P"*— mo t U 1 

 I must here observe that I adopt these terms as a matte, rrf course, 

 and not as the result of analytical investigation. The P«™ 

 scutum and scutellum are of nearly equal size, and all of them ap 

 p ch a triangular form, hut the position of the £££££ 

 the prascutnm the base of the triangle is towards the head oi the in 

 ct Urn ape, P«i»<i»« backwards: in the scutum this position is 

 eve Wed me apex pointing towards the insect's head and meetog he 

 apex of he prLcutal triangle; the base is posterior and meets the 

 la" o the scutellum, the apex of which consequently points bach- 

 wards the postscutellum is the largest of the four sections; anteno ly 

 Tt miis two'processes or limbs, which embrace the scutel to m. ; po t - 

 riralv it is prolonged over the abdominal segments, and terminates in 

 rl se P pex. The remaining pieces, exhibited dorsaUy are four 

 or two pairs : the anterior pair are large and l°-nge-shaped, they 

 occupy the upper pleuro-dorsal areai, and nearly meet at the same 

 poTas the a^ces of the praescntal and ■^•^A^T 

 mir are still larger, of irregular figure, and occupy the hinder pleuro 

 Zrart of tl segment they extend laterally as weU „ « 

 giving the body a somewhat inflated appearance: it »'» scar ^J Be 

 advisable to assign names to these pieces because • " » 

 versions entomologists might assign to such would Pf*»P 8 "*£ 

 tend to confuse than elucidate the subject. Immediately ».»* 

 of the anterior side-pieces is attached a large, membranous, delicate, 

 opaque wtag: when the insect is not flying these wings are loosely 

 „ P ,d q ed in aLgitudina, direction, reposing on each side ; o Hhe body 

 in this folding there is nothing fan-like, a term cons tantly bu errone 

 ously used in describing them, and one which would be *"*&««£ 

 cable to the wings of such Orthopterous insects as Rhip.plerjx, 



, I „., also here remark that the homology of the skeletons oftasects is not ,e. 



-*-,«« - - * ^frftC^TZZi the nemen- 

 t It should be home in mind, that when Stjlops was hrst aescno 



elatL of these parts was ^eh mo, a, ^ *£%£%£. and 

 rrh:vVr^rrtLr,;Ted S d oe?n„tfndlea,e a,, dmerenee of opinion. 



