142 
FURTHER ILLUSTRATIONS OF 
very short clypeus, and the broad but entire mandibles, of which 
the tips are black, and the under-side furnished with long hairs 
(fig. 3 a) ; the labrum is short, exposed and setose; the maxillary 
palpi are very small, but they consist of six joints (fig. 3d, Sc); 
the labial palpi are also minute, but they are four-jointed (fig. S d, 
S e) ; the prothorax is large and quadrate, being broader than 
the head, with the posterior portion rather narrowed; it is finely 
punctured and has a circular impression on each side, which may, 
however, possibly be accidental; the mesothorax is small and 
chesnut-red, and the metathorax black and punctated, with the 
lateral angles rounded off. The abdomen is very large, and semi- 
cylindrical, the first and second segments being destitute of gloss 
and very finely rugose, and the remaining segments glossy and 
impunctate; the anterior segment is yellow above, with several 
black dots on the deflexed basal part, and the hind margin is also 
black; the second segment has the anterior and posterior margin 
black, and of equal breadth ; the following joints are also similarly 
coloured, but the black basal part is much broader than the 
posterior margin; the sides of the intermediate segments are 
also dotted with black; the fifth segment is nearly as large as the 
preceding and not emarginate at its hinder edge; the terminal 
segment is entirely black, thick, convex above, truncated at the 
extremity, with the sides slightly striated (3/, 3 ^). The abdomen 
beneath is pitchy, varied with obscure red, the fourth segment 
having two transverse marks of this colour; the first segment is 
angulated at its base. The legs are chesnut-red; the anterior 
short, with the spur at the extremity of the tibim half as long as 
the tarsi; the basal joint of the tarsi, on the outer edge, spinose; 
the posterior femora ai’e emarginate on the hinder edge, beyond 
the middle, and the posterior tai'si are twice as long as the 
tibise. 
The six-jointed maxillaiy and four-jointed labial palpi, together 
with the strong spur of the fore-feet, the character of the second 
segment of the abdomen, and the notched posterior femora, 
are characters which do not occur in the females of the typical 
Thynui. I cannot, however, regard them as of higher value 
than speciHc, considering that the true character of the females 
of the genus Thynnus consists in the rudimental size of the palpi, 
and ^^hich is not overbalanced by their possessing the typical 
number of joints. 
