56 



BRITISH ICHNEUMONS. 



[ Cremastus 



(4)- 



Table of Species. 



I. Clypeus apically subtruncate and 



callose ; anterior tibiae subcon- 



stricted. 

 Submarginal as long as basal radial 



nervure ; stigma broad 

 Submarginal shorterthan basal radial; 



stigma narrow 

 Clypeus apically rounded ; anterior 



tibiae not at all constricted. 

 Lateral petiolar sulci entire ; thorax 



not pale-lined. 

 Clypeus not apically elevated ; hind 



tibiae mainly white 

 Clypeus apically elevated ; hind tibiae 



not white-marked 

 Lateral petiolar sulci short ; thorax 



usually pale-lined. 

 Scutellum riavous ; metathorax not 



apically produced. 

 Petiolar area transcostulate ; cheeks 



not short 

 Petiolar area very finely shagreened ; 



cheeks very short 

 Scutellum black ; metathorax apic- 

 ally produced over coxae 



GEMINUS, Grav. 

 BELLICOSUS, Grav. 



3. SPECTATOR, Grai 



4. PUNGENS, Grav. 



DECORATUS, Grav . 



INTERRUPTOR, Gvai 



INFIRMUS, Grav. 



1. geminus, Grav. 



Cremastus geminus, Gr. I.E. iii. 744, ? ; Thorns. O.E. xiv. 1454, <? ? . 



Head constricted behind the eyes ; clypeus twice broader than long, 

 apically truncate and subcallose ; labrum exserted ; mouth, a genal mark 

 and nearly the entire orbits, flavidous. Antennae extending beyond 

 thoracic apex, with flagellum apically subattenuate and its basal joints 

 rufescent beneath. Thorax black, with no di.stinct notauli; areola entire, 

 circumcarinate ; petiolar area not trans-strigose. Scutellum black. Ab- 

 domen with the second segment aciculate throughout and, in V only, red 

 with its base and a lateral spot black ; first segment apically rufescent in 

 both sexes ; terebra about half length of abdomen. Legs red, with the 

 anterior tibiae apically constricted ; hind coxae, trochanters, tarsi, with 

 both extremities of their tibiae and base of intermediate coxae, piceous 

 or nigrescent. Wings with the piceous stigma somewhat broad, and 

 tegulae stramineous ; submarginal nervure elongate and not shorter than 

 basal abscissa of radius. Length, 8-9 mm. 



This species and the next one are distinguished from our others by 

 both Thomson and Schm. by the subtruncate clypeus, the latter adds 

 that it is twice broader than long, the former that it is subcallose and the 

 anterior tibiae apically constricted. The breadth of the stigma and 

 colouration of the second segment will divide these two kinds, which 

 were synonymised by Marshall in 1872. 



This species appears anything but common on the Continent and to be 

 little known, though recorded from Germany (Grav.), France (Gaulle), 

 Austria (Kirchner) and Sweden (Thomson). In Britain it is an abundant 

 parasite of Psyche vi/losella, Och., from which Bankes bred three males 



