314 Mr. F. V/alker's Notes 07i Ohalcididce. 



by Dr. Algernon Chapman^ is allied to the Eupelmidce, 

 and the earliest descriptions of it are here mentioned : — 



Sphex colon, Linn. Faun. Suec. 1656; Syst. Nat. 945. 



Ichneumon quadrum, Fabr. Ent. Syst. ii. 186. 



Megastigmus albifrons. 



Mas. Luteus ; capite thoraceque dense punctatis; 

 capite thorace latiore, plaga transversa nigra, fronte 

 facieque albidis, antennis nigris, basi luteis; thorace 

 vitta nigra, prothorace magna quadra ta, mesothorace 

 nigro-bimaculato, metathorace nigro; abdomine nigro, 

 valde compresso, subtus luteo; alis diaphanis nigro- 

 venosis, anticis gutta nigricante maculaque nigra. 



Male. Luteous. Head and thorax thickly punctured. 

 Head broader than the thorax; a large transverse 

 black patch on the vertex, extending nearly to the eyes ; 

 front and face whitish; eyes piceous; antennae black, 

 filiform, rather shorter than the thorax, first joint luteous, 

 joints of the flagellum successively decreasing in length; 

 club fusiform, a little broader than the preceding joint. 

 Thorax with a black stripe, which is attenuate in the 

 middle, and extends from the fore-border of the pro- 

 thorax nearly to the tip of the scutellum; prothorax 

 quadrate, much developed; mesothorax with a black 

 spot on each side of the scutum, sutures of the parap- 

 sides very distinct; metathorax black. Abdomen black, 

 much compressed, luteous beneath, nearly as long as the 

 thorax. Legs slender; tarsi black towards the tips. 

 Wings pellucid; veins black; fore-wings with an in- 

 definite blackish dot adjoining the hind side of the 

 humerus, near the end of the latter, and with a deter- 

 minate black spot at the end of the cubitus, as is usual 

 in this genus ; humerus about four times the length of 

 the ulna, emitting a transverse veinlet to the hind border, 

 near the inner side of the dot before-mentioned ; radius 

 more than twice the length of the ulna; cubitus about 

 half the length of the ulna. 



Length of the body, 2 lines ; of the fore- wings, 3| 

 lines. 



" Found alive, in a glass-topped box, containing a fir 

 cone, from California." March 10th, 1869. 



British Museum. 



