110 Kev. T. A. Marshall's monograph of 



with 26-jointecl antennae. In three females I find the 

 antennae 23-, in another 26-jointed ; but the antennae of 

 SigalpJms are variable in the same species. S. fiavipalpis, 

 Wesm., is out of the question, because that writer says 

 that it so much resembles hmjioricola as perhaps to be 

 only a variety. 



I have before me five females and one male. Two 

 females were taken b}^ Walker, and two by myself at 

 Sandwich ; the remaining male and female were sent by 

 Fitch. Eatzeburg's >S'. aciculatus was bred in both sexes 

 from Ochina hedene, Miill., by Nordlinger at Grand Jouan, 

 in Brittany ; and again by Jacobi at Nordhausen, from 

 Anohimn rufipes, F., nesting in the decayed branch of a 

 plum-tree. 



7. Sigalphus ambiguus, Nees. 



Sigalphus ambiguus, Nees, Mag. Ges. BerL, 1816, 

 p. 253 ; Mon., i., 272, 3 ? ; Hal., Ent. Mag., iii., 

 128, c? ; Wesm., Nouv.Mem. Ac. Brux., 1835, p. 212, 

 c? ? ; Thorns., Opusc. Ent., vi., 1874, p. 562. 



Black, pubescent, legs rufous ; antenntc <y 22 — 24-, of the ? 22- 

 jointed ; abdomen convex, rimulose, the carapace undivided ; anus 

 in the $ emarginate, terebra shorter than the abdomen. Length, 

 li— li Un. 



Male. Black, hardly shining, pubescent, thinly punctulate ; 

 antennae attenuated at the apex; thorax short, anteriorly gibbous; 

 mesothoracic sutures broadlj' and thickly punctate, the inter- 

 mediate lobe longitudinally depressed ; metathorax very short, 

 apical angles aciitely elevated; abdcmcn very thoit, obovate 

 convex, entirely and thickly rimulose, dull, posteriorly with an 

 obsolete smooth longitudinal line, obtusely bicarinated at the base ; 

 sutures almost wholly obliterated, as in Chelonus ; legs short, 

 coxte fuscous ; hind legs stouter, tibiae at the apex, and tarsi, 

 darker; wings hyaline, stigma large, ovate, fuscous, the nervures 

 paler ; radial areolet larger than in S. caudatus and the kindred 

 species. According to Nees, the legs are sometimes fi;scous, the 

 fore femora at the apex, their tibiae entirely, and the posterior tibite 

 at the base, rufous. 



Var. Smaller; antenme 20-jointed ; colour of the legs fuscous, 

 &c. ; nervures pale. — Nees. 



I have not seen this species ; the description is taken 

 from Haliday, who found two males in Ireland. Wesmael's 

 male, taken near Brussels, had black trochanters and 

 21 -jointed antennae. 



