A Leaf-Mining Cranefly in Hawaii. 



BY OTTO II. SWEZEY. 



Dicranomyia foliocuniculator n. sp. 



Head, antennae and mouth parts dark fuscous; thorax and abdo- 

 men fuscous above, ochraceous below, abdomen sometimes greenish 

 below; halteres fuscous, the stem paler; wings fuscous-hyaline, not 

 spotted except a spot of more intense fuscous at the termination of 

 the first longitudinal vein; auxiliary vein for the last three-fifths 

 running very close to the first longitudinal vein, terminating a little 

 before the origin of the second longitudinal vein, connected with first 

 longitudinal a little before termination; venation as shown in Fig.; 

 legs slender, fuscous, femora paler towards base, coxae and trochan- 

 ters ochraceous. Length of body, 4mm.; wing, 5mm. 



HABITAT. Larvae mining the leaves of Cyrtandra palu- 

 dosa and other species of Cyrtandra, in the mountains at Puna- 

 luu, on the windward side of Oahu. i^o adults collected. I 

 first discovered the - mines of this insect in the leaves of Cyrtan- 

 dra bushes growing along the Punaluu Trail, June 11, 1911, 

 and reared a few specimens. Later, on the following dates, I 

 again collected mined leaves and reared a few more specimens : 

 August 10, 1913 ; September 13, 1914. The adults proved to 

 be different from any hitherto described species in Hawaii. 



MIXE. The mine is long and slender, more or less sinuous 

 and wandering about the leaf, often following the margin, grad- 

 ually widening as the larva increases in size. There may be as 

 many as a dozen mines in one leaf. 



LAPVA. The full-grown larva is 10-1 lm. elongate, slen- 

 der, cylindrical, gradually tapering posteriorly, without setae, 

 footless, anterior and posterior margins of segments (except 

 3 or 4 anterior and 2 posterior Ones) minutely roughened on 

 dorsal and ventral surface to assist in locomotion. Whitish, 

 transparent so that the alimentary canal and tracheal system are 

 plainly seen, the latter having two longitudinal tracheae con- 

 necting with two black spiracles above the anus. Head with 

 brownish mouth-parts, mandibles working horizontally, the 

 whole head retracting into the following segment which in turn 

 retracts into the next. Segments 1-3 of moderate length, 4-10 

 elongate, remaining segments short. 



PUPA. The pupa is formed within the mine, the larva 



Proc. Haw. Ent. Soc. Ill, No. 2, July, 1915. 



