Caecilius arotellus, N.Banks, 1942

Banks, Nathan, 1942, Neuropteroid Insects from Guam, Insects of Guam I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 25-30 : 26-27

4. Caecilius arotellus , new species (fig. 1, a, c).

Body pale yellowish, no mark on clypeus; vertex sometimes a little darker, and sometimes darker on sides of thoracic notum; legs and antennae pale. Wings hyaline, sometimes very faintly yellowish, often yellowish on pterostigma, not at all fumose. The wings are moderately slender; in the forewings the stigma is long, swollen behind, and tapering to tip; the union of radial sector and medius is quite short, but little more than one half the basal section of radial sector; the fork of radial sector is very slender; much longer than its pedicel; the branches of the medius nearly straight; the areola postica, nearly twice as long as high, highest toward base, and reaching fully one half way on hind margin to the branch of medius; the principal veins have one row of hairs, the stigma with many hairs. In hindwing, the medius curves up less divergent from the radial sector than usual; union of radial sector and medius is about twice as long as the basal section of radial sector. Length of forewing, 2 to 2.2 mm.

Piti , Machanao , Mt. Tenjo , Dededo , Fonte Valley , Sumay , Merizo , Upi Trail , Santa Rosa Peak , May , July , August , October , November , many specimens . Type and paratypes in collection of Hawaiian Sugar Planters' Association, paratypes also in Museum of Comparative Zoology (no. 23828).

The venation is similar to that of C. luridus Enderlein of New Guinea, but the wing is more slender, the areola postica larger, and the wing not fumose. The apical half of forewing is very much like C. angustus Enderlein of Australia, but the wing is not so long, and the cubitus runs nearer to the anal than to the medius; from C. castella Banks of the Philippines it differs in having the fork of the radial sector much more slender, and in the larger areola postica; these differences hold in a considerable series of each species.