1908] Fauna Ottawaexsis. 73 



insects are parasites of various nest forming hymenoptera and 

 the larva is stated to attach itself to that of its host and to 

 complete its growth at the cost of its victim's life. 



Family XXVII. — Ceropalidae, 



Subfamily I. — Pcpsince. 



1. S a 1 i u s n e b u 1 o s u s, Dahlb. Our largest species of which only 



one female has been taken. 



2. Salius conicus, Say. A black wasp with fuliginous wings, 



common in midsummer; 8 females, 1 male. 



3. Salius germanus. Cress. A small form of which one female 



was taken near Hull on 29th July, 1894. 



4. Salius alienatus, Say. This is a pretty little species with 



abdomen partly red; the wings clear, with a dark patch on the 

 front ones; 7 females in June and July. 



5. Salius n o t h u s. Cress. Resembles the forgoing but has no 



patch on wings; 1 female only taken. 



Subf amil y II. — .4 geniincs. 



6. Agenia architect a. Say. A small bluish clear-winged species 



reared from small clay cells built under stones; 6 females and 2 

 males. 



7. Agenia pulchripennis, Cress. This handsome polished 



black species with bimaculate wings is not uncommon; 6 females, 

 1 male. 



8. Agenia bombycina, Cress. A slender clear-winged insect 



determined for me by Mr. J. C. Bridwell; 3 males. 



9. Agenia atrata, Prov. Both sexes of this insect were des- 



cribed from specimens collected by Mr. Guignard near Hull; 

 not represented in my collection. 



10. Agenia p u 1 c h r i n a, Cress. One female taken 8th July, 

 1894, determined by Bridwell. 



U. Agenia calcarata, Cress. A small species with pale legs; 

 3 males. One of these, received from Mr. Guignard, is labelled 

 Ceropales nigricoxis, Prov., female, but I do not find any species 

 described under that name, and Provancher credits Guignard 

 with having sent to him the male of A. calcarata. 



12. Agenia rufigastra, Prov. This species, with red abdomen, 



was described from a female taken by Guignard near Hull. I 

 have not found it yet. 



Subfamily III. — Apori}UB. 



13. An o pi i us as t h i o p s. Cress. This is our largest species of 



the family and is a fine velvety black insect with dark wings. 

 It is also a strong and vigorous foe of our larger spiders. 



14. Anoplius biguttatus, Fabr. This is one of the commonest 



species, and is readily recognized by the white markings (vary- 

 ing in number) on the abdomen, although unspotted individuals 

 occur. The species is very variable in size; 8 females and 3 

 males. 



