June, 1918] Parasites oj Leaf-IIoppers 291 



EXPLANATION" OF PLATES. 



Explanation ou Platu L 



Fig. 1. GonatopHs crytlirodes, female. 



Fig. 2. PItorbas mirahilis. male. 



Fig. 3. Aphelopus dikraneuri, male. 



Fig. 4. Phorlxis niirahilis, female. 



Fig. 5. Gonalopus crythrodes. male. 



Fig. 6. Chelogynus oshonii. female. 



Fig. 7. Chela of Gouatopiis erythrodes. 



Fig. 8. Chela of Ilaplogonatopus americanus. 



Explanation of Plate II. 



Fig. 1. Normal male Erythroneura comes. 

 Fig. 2. Parasitized Erythroneura comes. 



Tes., testes; sto., storage stomach; hyp., hypertrophied tissue; par., 

 parasite, fourth instar. 



Explanation of Plate III. 

 Fig. 1. Parasitized male Erythroneura comes, longitudinal section. 

 Fig. 2. Normal male Erythroneura comes, longitudinal section. 



par., parasite, fourth instar; hyp., hypertrophied tissue; tes., testes. 



Explanation of Plate IV. 



Fig. 1. Normal male Erythroneura comes, cross section through second abdominal 



segment. 

 Fig. 2. Parasitized female Erythroneura comes, showing nature of hypertrophied 



tissue in early phase, cross section through second abdominal segment. 

 Fig. 3. Parasitized male Erythroneura comes, showing nature of hypertrophied 



tissue in late phase, cross section through point of attachment of 



parasite on first abdominal segment. 

 Fig. 4. Rarasitized male Erythroneura comes, cross section of same individual as 



Figure 3, through head of parasite on second abdominal segment. 

 Sto., storage stomach; tes., testes; hyp., layer of hypodermal cells 



developed around the wound produced in the host by the parasite; 



par., parasite; es.. esophagus; hyp., hypertrophied tissue; ch., heavy 



layer of chitin at point of attachment of parasite. 

 Camera lucida drawings, ocular 7.5. obiective 1(3 mm., Spencer 



Microscope. 



Explanation of Plate V. 



Fig. 1. Normal male Erythroneura co)ues, cross section through second abdoininal 

 segment. 



Fig. 2. Parasitized male Erythroneura comes, cross section through metathorax, 

 showing extreme anterior part of parasitic cyst. 



Fig. 3. Parasitized female Erythroneura comes, cross section through first abdomi- 

 nal segment just before attachment of parasite. 



Fig. 4. Parasitized male Erythroneura comes, cross section, third abdominal 

 segment. 

 Sto., storage stomach; tes., testes; hyp., hypertrophied tissue; gon., 

 rudiment of ovary; par., parasite. 



Explanation of pl.\te VI. 



Fig. 1. Parasitized male Erythroneura comes, cross section through second 

 abdominal segment at point of attachment of parasite. 



Fig. 2. Parasitized male Deltocephalus sayi, longitudinal section through testis 

 showing atrophy of this structure and disintegration of surrounding 

 tissues. This individual was dying from the effects of parasitism 

 at the time of fixation, the parasite being in the last stage. 

 Es., esophagus; hyp., hj'pertrophied tissue; m., membrane stirrotuiding 

 cyst; par., parasite; tes., testis; int., intestine. 



