138 JAMES WATERSTON. 



aspect remarkably bare ; no scapal groove ; tonili widely apart, nearer to the 

 inferiorly divergent orbits than to one another and just crossing the base line of the 

 eyes, with 4-5 bristles between and one or two (irregular) above. Clypeus gently 

 and broadly convex in the middle, with two clear pustules and a short slight flat lobe 

 at each side. 



Antennae : scape, pedicel, ring- joint, 6 funicular joints and 3 in club ; length 

 •47 mm., scape (20 : 7) over twice (12 : 5) the length of the pedicel (2 : 1), just shorter 

 than the sum of the pedicel, ring-joint and first four funicular joints, or just longer 

 than the entire funicle excluding the club ; the latter five-sixths of the scape in length 

 and a quarter broader. The funicle joints subequal (9, 8, 8, 7, 8, 10), the first joint as 

 broad as long, all the others transverse, 2-4 just broader than long, 5 and 6 consider- 

 ably expanded, 6 being half as broad again as long. Club distinctly swollen, twice as 

 long as broad and 2^ times as broad as the first funicular. The antenna has few 

 sensoria, on the club 4-5, long and narrow, and apparently none on the funicle. 



Mouth-parts : mandibles rather elongate, half as long again as the breadth at the 

 base or three times that of the apex. The latter truncate, with three small teeth, 

 the middle one broadest, the first smallest. The apical edge of the third (uppermost) 

 tooth if produced touches the angle between the first and the second. Mainly on 

 external apical third and above the ventral edge are about fifteen setigerous pustules. 

 Stipes of first maxilla as long as the sum of the third and fourth joints of its palpus. 

 The lateral bristle nearly half as long again as the first joint of the palpus. In the 

 latter the joints are in ratio 9 : 9 : 8 : 14, and their breadths 4:5:6:6. The first 

 and third are triangular, the second and fourth oblong, the latter with five bristles, 

 three at the tnmcate apex, one of them twice the length of the joint itself, and one at 

 each side. The galea bears 7-8 short apical bristles. The mid joint of the labial 

 palpus is reduced to a narrow wedge and the joints are approximately 10 : 3 : 5, 

 with a median breadth of 7. The longest apical bristle is nearly three times the joint. 



Thorax : The general shape of the thorax and the chaetotaxy and sculpture of the 

 mesonotum are seen in fig. 1. Pronotum in one piece, posterior edge evenly convex, 

 not emarginate at the spiracle, two posterior rows of short bristles (8-10) and one or 

 two single ones in front. Anteriorly the pronotum is semicircularly emarginate in the 

 middle and just above this is a small chitinous knob raised a little from the general 

 surface. The reticulation is transversely drawn out and much weaker on the upper 

 portion of the overlap. Prosternum (4 : 5) with large scaly reticulation. The strong 

 spine-like bristles on the mesonotum stand nearly erect, on the mid lobe there is a 

 single row, on the scutellum two rows. In the figure these bristles have on one side 

 been drawn flattened out to show their length. In conjunction mth the peculiar 

 furrowing of the notal surface, they possibly aft'ord a hold to the male during pairing 

 and the grooves may be comparable to similar structures in Dytiscus (Coleoptera). 

 These grooves are derived from a much drawn out and raised reticulation of the meso- 

 notum. Before the suture, about half the surface is so sculptured, the furrows being 

 longitudinal ; on the axillae and for a short space before the suture, the ridges are 

 transverse. Near the posterior edge of the tegula, where it is in line wdth the suture, 

 the surface is also gi'ooved. The metanotum consists of two nearly separate, narrow 

 grooved sclerites. Prepectus large, sterno-pleural surface nearly smooth, pattern faint 

 and fine posteriorly. Upper margin of mesoplenra in profile straight, without any 



