GENUS ABIA. 29 



Genus ABIA. 



Abia, Leach, Z. M., iii, 113 (1817). 

 Zarsea, Leach, 1. c. 



Antennae clavate, shorter than the thorax, 7-jointed, the club 3- 

 jointed ; basal two joints small, third the longest, nearly as long as the 

 fourth and fifth together, thin at base, slightly thickened towards the 

 apex, and a little curved on lower side ; the fourth is nearly of the same 

 size as the fifth, but is thinner, and is clearly separated from the fifth, 

 while that is distinctly separated from the club, the apical two joints 

 of which are closely amalgamated ; the last is obtuse, and is smaller 

 than the sixth in the $ , but is larger in the $. Wings with two 

 radial and three cubital nervures. The first radial is wider and shorter 

 than the second ; the first cubital is about one half longer than second 

 and much narrower ; the third is double the length of second. The first 

 cubital cellule receives both the recurrent nervures. Round the upper 

 edge of the second radial cellule is a surrounding nervure, which forms 

 at the apex of the cellule a small appendicular cellule. The lanceolate 

 cellule is largely contracted in the middle. The transverse median 

 cellule is nearly united to the transverse basal. In the posterior wings 

 are two median cellules. Eyes diverging on the inner side ; in the <$ 

 almost confluent on the top. 



The vertex is broadly depressed in the centre. The 

 lower ocellus is separated from the others by a deep 

 groove, which forms a sharp triangular depression 

 behind it. The front between the antennae is wide ; in 

 the centre is a groove, and there is a less distinct 

 transverse one in the middle, which divides it into an 

 upper and a lower less projecting division. Over the 

 clypeus is a deep curved groove. The clypeus is 

 truncated at the apex and projects in the centre. The 

 labrum is smooth, less rugged in texture, pitted with 

 small round depressions and semicircular at the apex. 

 The mandibles are stout, slightly curved, covered with 

 long hair on the outer side, and with a large apical 

 tooth and two irregular subapical ones. The inner 

 lobe of maxilla is broadly rounded at the top ; the outer 

 is broad at base, sharp at the apex, and reaches close 

 to the top of the inner. The maxillary palpi are short 

 and thick, the basal two joints are of nearly equal 

 length, but the first is much broader than the second, 

 the third is a little longer than the preceding two, the 

 fourth a little shorter than the third, and is a little 



