F. R. Petherbridge and M. A. Husain 185 



Orthotylus marginalis hatch about a fortnight later than P. rugicollis. 

 tSlightly smaller, orange yellow in first stage, later greenish yellow with 



bluish tinge, especially marked on lower surface. 

 Large orange coloured dorsal abdominal gland ivith faint lips. 

 Terminal joint of antenna smoky orange. More hairy than P. rugi- 

 collis. 

 Psallus ambiguus hatch about the same time as P. rugicollis. 



Smaller, orange yellow. Terminal joint of antenna smoky orange, 

 and very hairy. 

 Atractotomus mali (PI. X, fig. 1 1 ) hatch about a month later than P. rugicollis. 



Small, red, two basal joints of the antenna very much thickened. 

 Phytocoris populi hatch nearly a month later than P. rugicollis. 



Large. Antennae and posterior legs long. Mottled, ground colour 

 white with yellow and brown spots ; thorax with dark broad lateral 

 bands. Antennae and legs banded and covered with long hairs. 

 Phytocoris idmi differs from the preceding in being very much darker. 



The spots are green, brown and black. 

 Pilophorus perplexa. Dark reddish brown and bear a marked resem- 

 blance to ants with which they are usually found in association. 

 Head large flattened posteriorly and overlaps the front margin of 

 pronotum. A narrow white band across the anal margin of pro- 

 notum and a wider white band across the anal half of tergite I. 

 Terminal joint of antenna white. 

 Aetorhinus angulatus hatches nearly a month later than P. rugicollis. 

 Small, slender, yellowish green, recognisable by its very long antennae 

 and black bases of the tibeae. 



4. PLE810C0RIS RUGICOLLIS (FIEBER). 



Synonymy. 



Lygus rugicollis Falleri. Mono. Cimi. p. 76, 1818. 

 Phytocoris rugicollis Falleri. Hem. Svec. 1. 79. 6. 

 Capsus rugicollis Schaff. Wanz iii. 80-98, Fig. 299. 

 Phytocoris marginalis Zelt. I. L. 271, 5. 

 Plesiocoris rugicollis Fieb. Eur. Hem. 272. 



Renter Cap. 2. 43. 

 Lygus rugicollis Doug, and Scott. E. M. M. iv. 50. 



Adult (PI. X, fig. 10). 



The genus Plesiocoris Fieb. consists of only one species. The adult 

 Plesiocoris rugicollis is elongate oval; bright green; head, front part of 

 Ann. Biol, iv 13 



