THYSANOPTERA 68 



o 



Prothorax large and heavy and often strongly convex, as long as or longer than 

 the head. Fore-legs very long and strongly incrassate or swollen, with stout tarsal 

 tooth. The median grove on the prothorax is in most cases prominent, whilst the 

 notum does not attain the lateral margins. 



Male with scale (?) at base of tube. 



Type. Dolcrothrips flavipcs mihi. 



The following table, though rough, may be useful in separating the species' : — 



I. All femora yellow .flavipes, sp. nov. 



II. All femora concolorous with body : — 



A. Abdominal bristles well developed : — 



1. Size larger (3'5 mm.) ; cheeks slightly swollen and spinose near posterior 



third barbatiis, sp. nov. 



2. Size smaller (i-6 to 2-5 mm.) ; cheeks more or less evenly spinose : — 

 (rt) Abdomen dark brown, tube light reddish-brown, and almost as long 



as head bicolor, sp. nov. 



(/)) Tube concolorous with rest of body ; shorter than head : — 



i. Tube twice as long as broad at base ; lateral bristles on eighth 



abdominal segment obsolete .perkinsi, sp. nov. 



ii. Tube three times as long as broad at base; lateral bristles on 

 eighth abdominal segment present : — 



{aa) ? . Size smaller (1-65 mm.) ; hind angles of eighth abdominal 

 segment acuminate ; head long and narrow, one and one-half 

 times as long as broad and slightly longer than prothorax ; 

 prothorax narrower; abdominal bristles weaker angiisticeps, s^. nov. 



(M) 6 ■ Size larger (2-0 mm.) ; eighth abdominal segment simple, 

 head only a little longer than broad and slightly broader than 

 the prothorax ; prothorax large and convex ; abdominal bristles 

 stronger ovatus, sp. nov. 



B. Abdominal bristles abbreviated (tube short and very broad) intenneJiiis, sp. nov. 



C. Abdominal bristles obsolete lanaiensis, sp. nov. 



( 1 ) Dolcrothrips barbatus, sp. nov. 



Plate XVIII. figs. II — 14. 



^. Length 3'5 mm. ; breadth of mesothorax o'6 mm. 



Colour dark brown, tarsi, fore-tibiae and joints of hind and intermediate legs 

 yellowish-brown. 



Head one and three-quarter times as long as broad across eyes, and just as long 

 as prothorax. Cheeks parallel for half their length behind eyes and then rounded out, 



• D. diihius and D. sp. are not included in this table. 



