696 FAUNA HAWAIIENSIS 



Tube about five-eighths the length of head, twice as long as broad at base with the 

 sides narrowing to tip where it is a little more than one-half as wide as at base ; bristles 

 at tip rather long, but weak. Abdominal bristles weak, those on the seventh segment 

 being the longest. There are two pairs of strong wing-retaining spines on each of the 

 segments two to seven. 



Z- Very slightly smaller and perhaps more slender, having the fore-legs slightly 

 stronger. 



Larva. 



Tliere are two larvae in a separate tube which may almost certainly be regarded 

 as belonging to this species. 



It is a very distinct grub ; broadly speaking it is divided into five transverse zones 

 of coloration, the first fifth crimson, second yellowish-white, third and fifth crimson 

 and the fourth same as the second. 



More specifically the head, prothorax and fore-part of mesothorax are crimson with 

 the head tinged with brown, and eyes (which are very small and bead-like) darker ; rest 

 of mesothorax and the whole of the metathorax yellowish-white ; first three abdominal 

 segments crimson ; fourth, fifth and part of sixth segment yellowish-white, and base of 

 sixth, seventh, eighth, ninth and tube crimson, the last two segments being darker than 

 the preceding. There are seven antennal joints, which are dirty yellow and apically 

 darker, the legs too are yellowish and darker at knees. 



The bristles are knobbed as in the imago. 



Hab. Hawaii ; Kona, several females, two or three males and two larvae found on 

 Hilo grass at 2000 feet, September 1892 (Perkins). 



The larvae were not taken with the imagines but occurred on another occasion 

 with an acarid from Hilo grass on Mauna Loa (W.). 



DicERATOTHRiPS Bagnall. 



There is a single specimen, apparently a female, the type of a new species of this 

 genus in Dr Perkins' collection. It is possibly not an endemic form. 



We now know three species which may be tabulated as follows : — 



Antennae twice as long as head, joints three and four much elongated ; ante-ocular 



spines long; fore-femur with a few more or less strong, short spines within 



bicornis Bagnall, annatus Bagnall. 



Antennae scarcely one and one-half times the length of head, joints three and four 

 not strongly elongated ; ante-ocular spines short ; fore-femur without short spines 

 within hrevicoriiis, sp. nov. 



