2 Rev. T. A. Marshall's Monograph of 



obsolete. Radial nervure forrainjj a regular curve, not 

 sinuated, originating beyond the middle of the stigma. 

 Hind coxge not so much compressed, rugulose at the base. 

 First abdominal segment more than twice as long as the 

 hind coxjB, punctate-rugose, more or less emarginate 

 at the extremity ; 2nd segment smooth at the base, or 

 scarcely striolate ; abdomen ^ not so strongly compressed ; 

 4th and following segments very short. Size of the 

 species much inferior to that of Climnon. 



The insects are parasitic on the small acalypterous 

 Muscidm of such genera as Chlorops, Hydrcllia, etc. Of 

 the six British species niger is abundant everywhere, 

 viduus, gracilis, and elegans are less common ; podagricus 

 is doubtful, perhaps an accidentally deformed viduus ; 

 2)rocerus is rare. 



Table of Species. 



(2) 1. Mesothoracic furrows faintly traced, 



converging to a point near the middle 

 of the disc, thence continued in an in- 

 distinct line to the base of the scutel- 



lum 1. viduvs, Qxxr^s. 



(1) 2. Mesothoracic furrows more distinct, 

 punctate,' converging into a rather 

 deep fovea before the scutell urn ... 3 



(4) 3. Legs of normal length 5 



(3) 4. Legs very short, the hind pair hardly 



longer than the abdomen ; hind femora 

 incrassated, not longer than the tro- 

 chanters 2. podagricus, H.al. 



(6) 5. Abdomen entirely black, or at most 



somewhat piceous at the base of the 



2nd segment 3. H/f/er, Nees. 



(5) 6. Abdomen more or less rufous, testa- 



ceous, or yellowish in the middle ... 7 



(8) 7. Prothoi-ax red 4. procerus, Hal. 



(7) 8. Prothorax black 9 



(10) 9. Length 2|-3 lines; antennae 36- jointed 



in the 9 , 54-iointed iu the S 5. gracilis, ^a\. 



(9) 10. Length U-2h lines; antenna 30-32- 



jointed in the 9 , 40-45-joiuted in 



the S .. 6. elegans, HaL 



1. Ccelinius viduus, Curtis. 



Ghxnon vidims, ater, and ohscurus, Curt,, B. E., 289. 

 Alysia (C.) vidua, Hal., Hym. Brit,, ii, 22, ^ $ . 

 G. viduus, Marsh., Species des Hym. d'Eur, et d'Alg. 

 Bracon., ii, p. 515, $ $ . 



5 Black, pubescent. Head rather longer than broad ; posterior 

 margin of the vertex nearly straight ; front bearing an impression on 

 each side above the antenna;, and in the middle, a small carina ; 



