DELTOCEPHALUS PULICARIS. 65 



part thus : — D. socialis has a black patch on the 

 pygofer. The genital valve is less than half the length 

 of the genital plate. The side lobes are inflexed, and 

 the hind margin of the ventral segment in the female 

 rather strongly concave ; with a middle notch. In D. 

 distinguendus there is no black patch ; the genital valve 

 is one-third the length of the plate ; the side lobes of 

 the pygofer much shorter than the plates ; the middle 

 lobe of the pygofer is wide, with an angular notch on 

 each side. 



This insect occurs both in the macropterous and 

 brachypterous forms. It is locally distributed, but in 

 some seasons by no means uncommon. 



Size, 0'12 inch, or 3-()0 millimetres. 



Deltocephalus pulicapjs, Fall. Plate LII., figs. 

 1 to Ic. 



Deltocephalus pidicaris, H.-Schaff. ; Thorns. ; Flor ; 

 Marsh. ; Kirschb. ; Sahib. ; Scott ; Ferrari ; Fieb., 

 S. E. D. fig. 27 ; Edw. pt. ii. p. 58. 



This common species is very variable in its 

 markings ; the head and pronotum of some specimens, 

 like those shown in my figures, being almost spotless; 

 whilst others, which probably are the most common 

 forms, are spotted conspicuously with black. 



Very small. General colour brownish yellow, or almost 

 black. Vertex shorter than wide, and, taken together 

 with the eyes, broader than the pronotum. Scutellum 

 small. Two large round black spots between the eyes 

 are often seen in well-marked specimens, with smaller 

 spots on the apical border. A fine vertical line divides 

 the crown. Abdomen shining black ; apex blunt and 

 coarsely tufted. Genital plates three times longer 

 than the genital valve. Elytra non-limbated and 

 shorter than the abdomen ; in some specimens imich 



VOL. II. F 



