688 FAUNA HAWAIIENSIS 



slightly weaker, those on the eighth segment being very short and weak. The tube is 

 short and stout, being two-thirds the length of the head and only twice as long as broad 

 at base, 



D. perkinsi may be recognized from all the allied species by the form and 

 coloration of antennae ; from D. ovatus by the characters outlined above, and from 

 D. lanaiensis by the well-developed bristles. 



$ unknown. 



Hab. Lanai, one female, 2000 ft., December 1893 (Perkins, No. 92). 



(5) Dolerothrips angiisticeps, sp. no v. 



Plate XVIII. figs. 20 — 22. 



$. Length i "65 mm., breadth of mesothorax o"43 mm. 



Colour chestnut-brown, abdomen with reddish-brown sub-lateral patches, fore- 

 tibiae yellowish and all tarsi light brown. Antennae unfortunately broken in the type 

 specimen. 



Head linear, long and narrow, one and one-half times as long as broad and a little 

 longer than the prothorax. Fore-coxae with but few spines, one of which is decidedly 

 longer than the others. Prothorax a little more than three-quarters as long as broad, 

 not dorsally convex ; mid-lateral bristles and pair at posterior angles very long, posterior- 

 marginal pair shorter and weaker. 



Abdomen comparatively broad, segments more distinctly sculptured laterally; hind 

 angles of the eighth segment prominent. Tube long and somewhat narrow, about four- 

 fifths the length of the head and three times as long as broad at base. 



$ unknown. 



This species is one of the smallest in the genus, and a very distinct one which may 

 at once be recognized by the long and narrow head, and the form of the eighth abdominal 

 segment. Otherwise it is somewhat similar in form to D. lanaiensis from which it may 

 easily be separated by the character of the prothoracic setae and by the presence of 

 well-developed abdominal bristles. 



Hab. Molokai ; Kalae, one male, August 7th, 1S93 (Perkins, No. 172); and 

 Molokai Mts., at 3000 ft., September 8th, 1893 (No. 171). 



(6) Dolerothrips bicolor, sp. nov. 



Plate XIX. figs. 2 1- — 22. 



%. Length 2'5 mm., breadth of mesothorax 0'5 mm. 



Colour dark brown, head slightly lighter than body and shaded darker laterally and 

 apically. Abdomen deepening towards end to a coal-black ; tube light reddish-brown, 

 thus contrasting strongly with the considerably darker coloration of the abdomen ; 



