326 Prof. 0. Heer on the House Ant of Madeira. 



small black tubercle. The upper side of the mesonotum is quite 

 even, with only a faint longitudinal groove. The scutellum 

 (fig. 1.3 b'^) is attached immediately to the mesonotum ; it is 

 abruptly truncate in front, bluntly rounded behind. The side- 

 plate of the middle thoracic segment is of about the same size as 

 that of the anterior, and receives the coxa of the middle leg. 

 The first piece of the metanotum is extremely short (fig. i. 

 3c'); the second piece (its scutellum, fig. i. 3 c^) is indeed 

 longer, but still small and strongly attenuated backwards. On 

 the back it is even ; on each side bordered by a raised margin, 

 on which stands a distinct prominent black spinule. 



The legs are moderately long, with thick but short coxse, 

 small trochanters, and femora dilated in the middle. The 

 tibia is considerably shorter than the femur. The anterior 

 tibia is thickest in the middle, slightly rounded forwards on 

 the inner side, where there is placed a moveable proportionably 

 large hook, furnished on its inner side with a membranous 

 border, which is fringed with a row of fine straight setai (fig. i. 

 6 c), giving it the appearance of a comb. The tarsi are long, 

 and extremely slender and filiform. The first joint is nearly 

 as long as the tibia, but the four following are vei-y short. 

 The fifth is thickened outwards, and provided with two curved 

 very sharp claws (fig. i. 7), between which lies a membranous 

 flap (or lobe). The first tarsal joint in the four hinder legs is 

 straight, but in the anterior pair is very strongly curved at the 

 base, the curve answering to the pectiniform hook, which has a 

 similar curvature. It is also worth notice, that on the parts of 

 the tarsus answering to the hook, the tarsus is clothed with a 

 thick fine felt of hairs ; whilst on the other parts of the tarsus, 

 these hairs are longer and less closely set. 



The wings extend pretty far beyond the apex of the abdomen. 

 The fore-wings are much narrowed at the base, and attain their 

 greatest breadth at three-fourths of their length. They have a 

 distinct, pretty large stigma. The radial cell, before it, is open, 

 for the vena scapularis does not run into the margin. The 

 cubital cells are three, of a similar form to those of the Attae. 

 The inner cubital cell is polygonal and irregular ; it is conti- 

 guous to the stigma : the second is also closed, somewhat bell- 

 shaped and pedunculate ; the cross vein which divides it from 

 the third open large cubital cell is connected with the cross-vein 

 which divides the inner cubital cell from the radial cell, and 

 which issues from the stigma. The inner discoidal cell is rhom- 

 boidal and rather small; but the outer discoidal cell is very 

 large and open. The area intemo-media is divided into two cells, 

 of which the outer one is open, the vena interno-media running 

 out free. The hind-wings are considerably smaller than the 

 fore, and the vena scapularis is connected already at one-third 



