1883.] 51 



be added to it, a synopsis of the species of this genus may not be 

 without interest to British entomologists. From this synopsis I ex- 

 clude, however, the well and easily known glohuUfer and annulatus, 

 treating only of the species characterized by the head being pale above, 

 black behind the eyes at the sides, and marked between the eyes with 

 two brown or black stripes diverging in the front (in epilohii the head 

 is mostly entirely pale). As almost all these species, especially errans, 

 hyalinipennis, stacliydis, and 2^^^li(^ornis, are in a high degree variable 

 as to colour, I will try to employ principally plastic characters, which 

 limit the species more distinctly and accurately. 



1 (12). Antennae and legs distinctly pubescent. 



2 (9). Antennae always much longer than half the length of the body (with the ex- 



ception of the hemielytra) ; the first joint as long as, or vei'v little shorter than, 

 the head seen from above (at least, if the clypeus is not taken with it), and not 

 or scarcely shorter than the posterior margin of the vertex ; the second joint 

 linear, always distinctly longer than the pronotum. The head, seen from above, 

 not or only a little transverse, seen from the front, twice as long as margin of 

 vertex ; behind the eyes long or rather long, constricted ; the front gradually 

 declivous, clypeus rather slightly arcuated, the throat long. Rostrum reaching 

 to, or beyond, the posterior coxse. Legs long, or very long, the anterior coxse 

 reaching much beyond the middle of the mesosternum. 



3 (-i). Antennae and legs very long. Antennae with the first joint distinctly longer 



than the posterior margin of the vertex ; the second joint as long as the scu- 

 tellum, pronotum and head together; the last two joints together as long as 

 the second ; the second joint fuscous only at the apex. Pronotum with the 

 transverse impression behind the middle. Thighs beneath rather densely pro- 

 vided with somewhat short and rigid black bristles. Posterior tibiae with long 

 spinulae, about four and a half times as long as the width of the head (with the 

 eyes). Male and female dimorphous 1. D. pallidtts, H.-Sch. 



4 (3). Antennae with the first joint as long, or almost as long, as the posterior margin 



of the vertex ; the second joint ((J) as long as scutellum, pronotum and head 

 to the base of the clypeus (seen from above), or mostly (especially $ ) shorter. 

 Thighs rather long, pubescent, beneath without black rigid bristles. Male 

 always winged, with completely developed hemielytra. 



5 (6). Pronotum with the transverse impression in the J a little behind the middle, 



in the ? very distinctly behind the middle. Antennae with the second joint at 

 the base and apex fuscous, as long as the scutellum, pronotum and head to the 

 base of the clypeus (c?), or only to the transverse impression of the vertex 

 behind the eyes ( ? ) ; the last two joints together scarcely ( c? ) or distinctly ( $ ) 

 longer than the second. Cuneus at the apex narrowly dusky. Posterior tibiae 

 about four times as long as the width of the head (with the eyes). Female 

 dimorphous 2. D. constrictus. Boh. 



6 (5). Pronotum with the transverse impression in the middle, or almost the middle. 



E -2 



