NEUROPTERA 65 



(4) Agrion nigro-hamatum Blackb. 



Agrion (?) nigro-haniatiim Blackburn, Ann. Nat. Hist. (5) xiv. 1884, p. 414. 

 (Plate V. figs. 5 & 5«.) 



Race nigro-lineattwi, van nov. 



Of considerably smaller average size than typical specimens and with a distinct 

 black line on the upper side of the femora. This point of difference had already 

 been noticed by Mr Blackburn in his note on the species (/. c), but the other 

 distinctions between the type and his Oahuan examples, as there given, will hardly 

 hold in a series of the two forms. 



Hab. Typical examples common on Maui and Molokai. Race nigro-lineatum 

 common on Oahu and also found on Hawaii. 



Obs. The bright yellow face and the colour of the eyes, which are bright green 

 or turquoise blue on the lower half, and red on the upper, give this species a most 

 remarkable appearance when flying around the streams. The colour of the eyes 

 fades after death. 



(5) Agrion koelense Blackb. 



Agrion (?) koelense, Blackburn Ann. Nat. Hist. (5) xiv. 1884, p. 417. 



This species varies considerably in several of the points that are used in the ori- 

 ginal description. The number of cellules surmounted by the pterostigma is variable in 

 all, or nearly all, the Hawaiian species and of no specific value here or in other species. 

 The number of cellules between the quadrilateral and nodus is three or four. The 

 post-cubitals are usually 16 or 17 in number. The upper margin of quadrilateral 

 usually about one-third the length of the lower, in the front wings, but more than 

 one-third in the posterior pair. Sometimes, as is also the case in allied species, the 

 t assumes more or less the colour of the ?, the femora being pale beneath, and the 

 sides of the thorax bearing pale longitudinal stripes as in that sex ; in fact these 

 are the only characters of colour by which the % is usually distinguished. The 

 valvules are sometimes pale, sometimes black, their appendages, as also the superior 

 pair, are black. 



In the t the superior appendages, viewed laterally, have their upper and lower 

 margins subparallel, the apical angles produced into two processes of which the upper 

 is somewhat more strongly developed than the lower. (Plate V. figs. 7 & 7«.) 



Hab. Mountains of Lanai (2000 ft. and upwards) and in the lao Valley of 

 the West Maui Mountains. 



9—2 



