COLF.OPTERA 515 



Group 6. Br^acl forms, very tincK' punctLired, with definite trans\-erse impressed 

 line before base of thorax. Keel ot prosternum 2\ to 3i times as long as broad. 

 Mesosternum impressed nos. 22 and 23. 



Group 7. Smooth, with punctuation \'erv shallow and vague, or quite absent. 

 Basal thoracic impression absent or slight. Keel ot prosternum about twice as long as 

 broad. Mesosternum imjiressed nos. 24 — 28. 



Group 8. Very small, at most i mm. long, smooth. No impressed area at base 

 of thorax. Prosternum short, keel usually less than ir^ times as long as broad. [Me.so- 

 sternum impressed or not so.] 



8 a. Elytra marked with fine curved scratches no. 29. 



8 b. Almost or quite impunctate and without scratches nos. 30 — n. 



Section I. .Scutellum visible. 



(i) Acritiis iiisii/aris, Sharp. 



Acritiis iusii/an's S)\\?Lr\), Tr. Dublin Soc. iii. 1SS5, p. 129. 



Plate X\'. figs. 35, 36. 



I have examined the type, found by Mr Blackburn, and one specunen found by 

 Mr Perkins. 



The species is distinguished from all other known Hawaiian members of the genus 

 by the presence of a distinct triangular scutellum. Also the head bears numerous 

 punctures, almost as strong as those on the rest of the bod)- (there is no transverse 

 suture before the antennae); there is a marked chain of punctures along the base of the 

 thorax, arcuate in the middle, the surface of the thorax between the arcuation and the 

 scutellum being impunctate. The remainder of the thorax, and the elytra, are evenly 

 and fairly strongly punctured: the propygidium and pygidium are numerously and 

 almost as strongly punctured as the rest. 



On the underside the distinguishing character lies in the presence ot a row ot 

 coarse, somewhat elongate, punctures along the meso-metasternal suture. Keel ot the 

 prosternum oblong, about if times as long as broad in the middle, punctured, with 

 surface slightly convex, striae slightly sinuate; metasternum strongly punctured at the 

 sides, punctures obsolete in the middle ; first abdominal segment strongly punctured. 

 The striae on metasternum and first abdominal segment diverge considerably, but end 

 blindly, not curving up behind the coxae. The third ventral segment extends on to the 

 dorsal surface, appearing as a piece on either side in front of the propygidium. Colour 

 blackish-piceous, legs and antennae brown. Length i mm. Wings not examined. 



Hab. Oahu. Near Honolulu (Blackburn) ; mountains near Honolulu (no. 75S, 

 Perkins). 



