176 [January, 



2. Cephus linearis, Schr. (vol. ii, pi. vii, fig. 2), 

 = quinquefasciatus, 8te.,faunus, Thorns., nee Newm. 



3. Cephus S^TTErs, Pz. 



This is a smaller species than linearis, and is easily known from it by the pro- 

 notum being entirely black, by the vertex being without any marks, by the marks on 

 the abdomen being very much smaller, the 4th segment also being entirely black ; 

 the 2nd cubital cellule is shorter compared to the 3rd. The S is readily separated 

 from (J linearis by the femora and coxae being entirely black. 



As British I only know the species from a specimen in Shuckard's 

 collection. It has no note of locality. Further evidence of the 

 species being really British is very desirable. 



Sub-aenus CEPHUS. 

 Antennae 18 — 21-jointed; apex clavate or sub-clavate ; the basal 

 two joints of maxillary palpi sub-equal ; the 6th scarcely double the 

 length of 4th ; eyes reaching to near the base of the mandibles. 



Females. 



1 (2) Hind tibiee with only one spine ; antennse longish, the 3rd joint almost 



shorter than the 4th ; posterior legs fuscous ; ovipositor short ; abdominal 

 segments 2 — 6 bordered with yellow arundinis. 



2 (1) Hind tibise with two spines. 



3 (4) Abdomen entirely black ; antennae 18 — 20-jointed, clavate ; 1st recurrent 



nervure interstitial phthisicus. 



4 (3) Abdomen marked or banded with yellow. 



5 (6) A longish spot on side of each of the abdominal segments, the whole forming 



an almost continuous band tabidus. 



6 (5) Abdomen with two or more yellow belts. 



7 (8) Apex of abdomen black, a yellow band only on the 4th and 6th segments ; 



head sub-cubital ; vertex emarginated ; length, 7 — 8 lines ... troglodyta. 



8 (7) Apex of abdomen yellow ; head transverse ; vertex scarcely emarginated ; 



length, 2\ — 4 lines. 



9 (10) Abdomen with two complete yellow bands ; antennae brownish at apex ; 



breast and vertex pilose ; hind tibiae and tarsi testaceous pusillus, 



10 (9) Abdomen with more than two complete bands ; hind tibiae and tarsi fuscous... 



pygmcBus. 

 Males. 



1 (2) Breast, coxae and femora more or less yellow pygmcBus. 



2 (1) Breast black. 



3(4) Abdomen entirely black phthisicus, var. 



4 (9) Abdomen banded with yellow. 



5 (6) Abdomen with three complete bands, on the 4th, 5th and 6th segments ; an- 



tennae 18 — 20-jointed phthisicus. 



6 (5) With only two complete yellow bands. 



7 (8) Length, 7—8 lines ; the 4th and 6th abdominal segments yellow ; head cubical ; 



vertex emarginated , troglodyta. 



