some allied Genera of Hymenopterous Inscctii. 261 



Gen. Crust. 4, 385), and as J urine's figure of tlie mandible of 

 A. striatus (taken from his unique female) differs in the toothing 

 from my dissections and Latreille's description, I considered it 

 probable that the difference might be sexual ; having, however, 

 also dissected a temale o{ A. atcr I find that its mandibles (fig. 9rt) 

 are short, with a rather broad obtuse apical tooth, and three others 

 smaller and more obtuse within. In the males of A. Patrati they 

 are, as described by Latreille, " cornese breves crassiusculee, latere 

 interno tridentato, dente apicali acutiore, paullo longiore, inferis 

 duobus obtusis"(fig. 8d); in one mandible however the apical 

 tooth was furnished with a slight acute process within, like 

 the rudiment of anodier tooth (fig. 8e) The labrum (PI. XIV. 

 fig. 8 c), overlooked by Latreille and Esenbeck, is very minute 

 and membranaceous, subtriangular, with the angles rounded and 

 the sides rather emarginate. The maxillary palpi are G-jointed 

 (fig. 8/), and the labial ones 4-jointed (fig. 8g). The abdomen 

 is implanted on the tergum of the metathorax, at a much greater 

 distance from the scutellum than in Fceniis. The fore wings have 

 one large marginal cell and three submarginal ones ; the first of 

 which generally receives the first recurrent vein, although in some 

 species this vein extends to the place of union of tlie first trans- 

 verso-cubital vein with the cubital one, so as in fact to become 

 continuous with the first transverso-cubital. In A. compressus 

 the first recurrent vein is inserted in the second submarginal 

 cell. The first transverso-cubital vein is very oblique, the 

 second is generally obliterated in the middle so as to give the 

 appearance of the second submarginal cell being outwardly in- 

 complete, this second submarginal cell receives the second recur- 

 rent vein, but at a short distance before its insertion the cubital 

 vein itself is seen to be slightly angulated witli a slight thickening 

 at the angle, indicating, as it were, the obliteration of an inter- 

 mediate transverso-cubital vein, which could extend to the upper 

 extremity of the first of these transverse veins. The third sub- 

 marginal cell extends to the extremity of the wing ; the veins of 

 the liind wing are almost obsolete. The legs are slender, the hind 

 ones not incrassated, as in Stephanus and Fccmis ; the ungues of 

 the tarsi are acute at the tip, with two teeth within (fig. 7 c). 



On reviewing the characters of this genus we find them agree- 

 ing with none of the Ichneumoncs genuini. With Alysin, however, 

 they present a much nearer relationship, especially in the broad 

 dentate mandibles (although the position of these organs at rest 

 is quite difFercnt in the two genera), the labrum, niaxill.'c, labuuji, 

 and palpi. With the exception of the second recui rent vein being 



