ENEMIES OF APHIDES. 177 



as otherwise the opacity of the insect hinders any but the lateral 

 prominences from being apparent. 



EXPLANATION OF PLATES VIL & VIII. 



Plate VII. 



Aphidivorous Hemiptera. Illustrations of Capsus lanarins (Linn.). 



Fig. I. — Capsii,s lanarins, larval stage. The stiff, flattened bristles are 

 a very noticeable feature at this stage. The thickening of 

 the second joint of the antenn.e is not yet apparent, but the 

 labrum and rostrum are strongly developed. 



,, 2. — C. lanarius, nymph or pupa stage. Here the development of 

 the wing pads, the thickening of the second joint of the 

 antennyp, and the widening of the abdomen are very apparent 

 features. 



,, 3. — C. lanarius, imago, a. Vertex ; b, prothorax (the upper 

 surface seen is the prouotum) ; c, mesothorax (the only por- 

 tion of this visible is the triangular scutellum) ; d, raetathorax 

 (this is not visible with the wings closed) ; e, hemelytra ; 

 f, membrane of hemelytra. 



J? 4. — C. lanarius, hemelytron. a, Clavus ; b, corium ; c, cuneus ; 

 d, membrane. The surface of the corium is deeply pecti- 

 nated. 



,, 5. — One of the membranous posterior wings of same. 



Plate VIII. 



Fig. 1. — The attack of Capsus lanarius (larva) on a Pear Aphis. The 

 capsid, coming suddenly over the edge of the leaf, has trans- 

 fixed the aphis with its rostrum, 



)> 2. — Head of C. lanarins (larva) from above. The projection of 

 the labrum beyond the vertex and covering the base of the 

 rostrum is very noticeable, and also the flattened bristles of 

 the epidermis. 



,, 3. — Head of same from below, exhibiting the position and forma- 

 tion of the rostrum. 



>i 4. — The rostrum, showing towards the base the labrum, a, and at 

 b the conjoined setse, lifted out of the groove in the labial 

 sheath. 



?) 5. — The four setse, removed from the rostrum ; the two exterior, 

 sheath-like setae (apparently corresponding to the maxillae 

 in mandibular insects), separated from the central piercing 

 organ. 



>j 6. — The extremity of the closed setse, as they appear in a nearly 

 related genus. 



ji 7. — The extremity of the actual piercing setse (apparently homo- 

 logues of the mandibles and ligula), showing the grooved and 

 sliding structure. 



Internatiox\al Journal of Microscopy and Natural Science. 

 Third Series. Vol. VI. M 



