178 On the Neuroptera of the Hawaiian Islands. 



not at all improbable that some confusion in the locality 

 labels subsequently occurred. 



That the insect is not a true Trithemis seems sufficiently 

 certain. Kirby's genus Deielia may be retained for it at 

 present, with a single species, as follows : — Deielia phaon, 

 Selys, forma dimorph. $ dispar, Seiys, =fasciata, Kirby. 

 It may be that the form dispar is really the typical condition 

 of the female; it is certainly the most abundant form in 

 collections, and the band on the wings varies greatly, in some 

 examples being reduced to vanishing point. 



Subfam. Agbionina. 



Megalugrion Blackhurni, McLach. 

 Megalajifion Blackhurni, McLacli. /. c. p. 238. 



The typical examples were from Maui. Mr. Wilson 

 brought five males from Lanai wliich scarcely differ, the 

 chief discrepancy being that the abdomen shows scarcely a 

 trace of the narrow apical black ring on segments two to five 

 which is conspicuous in the examples before me from Maui. 

 This additional material proves, however, that the precise 

 details of neuration as regards what may be termed the 

 supplementary rows of cellules are extremely unstable, 

 differing slightly in each individual. 



In addition to these Mr. Wilson brought one or two imper- 

 fect examples of an Agrion{?) of the xanthomelas group, 

 peculiar to the islands ; these specimens are too mutilated 

 for identification. 



NEUROPTERA-PL ANI PENNI A. 

 Fam. Myrmeleonidae. 



Formicaleo Wilsoni, sp. n. 



(Head and pronotum destroyed.) Meso- and metathorax 

 and abdomen above and below dull leaden-black, without 

 markings, but there are faint indications of a very narrow 

 pale ring at the apex of the abdominal segments (end of abdo- 

 men destroyed) ; abdomen rather densely clothed with hairs, 

 which are blackish above and hoary beneath. Legs : femora 

 shining black, paler beneath, clothed with hoary hairs and 

 furnished oeiow with long and strong black spines ; tibiae 

 yellowish, with a black ring at the base and apex and another 

 towards the base, the space between the latter and the apex 

 spotted with black ; spurs about as long as the first three 



