138 HYMENOPTEKA. 



dicular keels all over. Postpetiole raised in the middle, finely punctured, the apex of 

 the depressed sides more strongly punctured ; the base shining, with some scattered, 

 large punctures. Abdomen finely and closely punctured, opaque, the apex acute, 

 narrower at the second segment ; gastrocceli large, deep, wider than long, the bottom 

 reticulated, the sides very finely punctured. Legs long, covered with a dense fuscous 

 pubescence ; the tarsi bear some stiff bristles. Areolet angled, broad at the top, half 

 the width at the bottom. 



Differs from I. pollux in its fuscous wings, stigma, and tarsi ; in the abdomen being 

 narrower ; in the upper median area of metanotum being broader than long, and not 

 narrowed at the apex. 



2. Ichneumon pollux. 



Purpureus ; antennas nigris ; alis atro-violaceis. $ . 

 Long. 26 millim. 



Hah. Mexico, Orizaba [BilimeTc). 



Body very finely and closely punctured, semiopaque, velvety, covered with a close 

 black pubescence. Scutellum not much elevated above the mesonotum, coarsely and 

 closely punctured, narrower at the apex. Upper median area in metanotum longer 

 than broad, the sides narrower and curved from where the lateral carina? are received ; 

 the other areas clearly defined. Petiole smooth and shining, the apex depressed in the 

 centre ; postpetiole closely and rather strongly punctured. Abdomen broad in the 

 centre, narrower at the base, more sharply pointed at the apex, the contraction being 

 gradual from the middle ; gastrocceli broader than long, large, not very deep, irregu- 

 larly reticulated in the centre. Areolet 5-angled, broad at the top, half the width at 

 the bottom. 



The deep purplish-black, semiopaque, very finely and closely punctured, and velvety 

 oody of this species separates it from its allies. 



3. Ichneumon costaricensis. (Tab. VII. fig. 3.) 



Hdb. Costa Eica, Volcan de Irazu 6000 to 7000 feet (Bogers). 



In coloration this species differs from the preceding merely in the body being of a 

 much brighter bluish tint, this being especially noticeable on the abdomen, which is 

 more shining ; it is a more slender and narrower insect ; the punctuation is closer ; the 

 scutellum is broader, and not so much narrowed behind. The upper median area of 

 metanotum is a little broader than long, and is not at all narrowed behind; the 

 boundaries of the lower area are much more clearly indicated. The postscutellum is 

 higher and with a much more distinct slope towards the second segment, and 

 more closely and finely punctured than the scutellum. The gastrocceli are deeper and 

 more shining, and the abdomen is narrower. There is no perceptible difference 

 between the wings of the two. 



