698 .FAUNA HAWAIIENSIS 



Abdominal spines very long, moderately stout, dark but light-coloured towards tip ; 

 those on ninth segment as long as tube. The surface of the tube is minutely asperate, 

 having the a23pearance of being regularly set transversely with rings of minute scales. 

 ^ unknown. 



Hab. Oahu ; one female, in the mountains, Kawailoa gulch, April 1901 (Perkins, 

 No. 768). 



D. brevicornis very closely resembles D. bicornis Bagnall but may be recognized by 

 its comparatively longer head, the short frontal cephalic spines, the shorter and com- 

 paratively stouter antennae, and the more slender tube. 



In D. bicornis the head is broader, the antennae are twice the length of the head, 

 the third joint being three times the length of the second (Plate XVIII. figs. 4 and 5), 

 the frontal spines reach considerably beyond the apex of the first antennal joint, whilst 

 the space between the eyes, and therefore between the posterior ocelli, is much greater. 

 The form of the prothorax and the prothoracic bristles of both species are practically the 

 same. The tube in D. bicornis is longer in comparison to the head but is only a little 

 more than three times as long as broad at base. The surface is more shiny than in 

 D. brevicornis apparently aciculate, or perhaps finely alutaceous and very sparsely, and 

 very minutely setose. The bristles at the apex of the ninth abdominal segment are 

 decidedly longer than the tube. 



Suborder TEREBRANTIA. 



Fam. TH RIP I DAE Haliday. 



Heliothrip.s Haliday. 



( I ) Heliothrips haemorrhoidalis, Bouch^. 



Syn. Hinds, Proc. U.S. Nat. Museum, 1903, xxvi. pp. 168 — 170. 



This is a common hot-house pest throughout Europe and North America in which 

 parts of the world it is almost, if not entirely, confined to green-houses'. Franklin 

 considers that H. haeniorrhoidalis is evidently a tropical species, and recently records 

 it in a wild state from St Vincent and the Barbados". 



Some of its food plants in St Vincent, he says, are Cacao and Kola, whilst in 

 Barbados it is found on date palms. 



There are three specimens in the Perkins collection, one from Kauai and the 

 others from Hawaii, and as Dr Perkins makes no mention of finding them in hot-houses 

 and states that one of the specimens was taken by sweeping, I presume that they were 

 taken in the open, though, at the same time, H. Iiaeniorrkoidalis is most certainly not 

 an endemic form. 



' I have just received numerous examples from Spain where they infest banana palms. 

 - Proc. U.S. Nat. Museum. 



