H^DMAGOGUS ALBOMACULATUS 869 



below. Legs blue-black, the mid and hind femora white below towards base. Base 

 of the first submarginal cell slightly nearer the base of wing than base of the 

 second posterior cell. 



22 specimens, Sonsonate, Salvador (F. Knab), San Juan, Trinidad (F. W. Urich), 

 Cacao, Trece Aguas, Alta Vera Paz, Guatemala (Schwarz & Barber), Livingstone, 

 Guatemala (H. S. Barber). 



Type. Cat. No. 10,024, U. S. Nat. Mus. 



The larva was confused by us with that of splendens Williston (cyaneus Theo- 

 bald, not Fabricius). The table (Journ. N. Y. Ent. Soc, xiv, 191, 1906) should be 

 corrected under dichotomy 43 by striking out "short abdominal hairs stellate" 

 and for ' cyaneus " read " 45 ". Add a new dichotomy, 45, as follows: 



45. Pecten reaching over half of tube, of about 18 teeth; secondary 



abdominal hairs not stellate regalis 



Pecten not reaching half of tube, of about 12 teeth; dorsal abdominal 

 hairs stellate, long splendens 



Desceiption of Female, Male, a?{d Larva of H^magogus albomaculatus: 



Female. Proboscis moderately long, subcylindrical, uniform, labellae 

 conically tapered ; vestiture deep blue-black ; setae minute, curved, black, those 

 on labellae more prominently outstanding. Palpi small, about one-sixth as long 

 as the proboscis ; vestiture black ; with a few moderate setse. Antennae filiform, 

 the joints subequal, rugose, pilose, black ; second Joint slightly thickened towards 

 apex ; tori rather small, subspherical, with a cup-shaped apical excavation, black, 

 with a few minute hairs on inner side. Clypeus prominent, rounded triangular, 

 convex, black, nude. Eyes black. Occiput clothed with broad, flat metallic 

 dark-blue scales with a violet reflection, margins of eyes silvery, sides behind 

 and cheeks silver-scaled ; setae along margins of eyes small, black. 



Prothoracic lobes large, closely approximate dorsally, collar-like; clothed 

 with metallic, dark violet-blue scales and a few stifle black bristles. Mesonotum 

 black, clothed with elliptical flat black scales with metallic green, olivaceous 

 and blue reflections ; bristles over roots of wings small, black. Scutellum trilo- 

 bate, clothed with metallic-blue scales, each lobe with a group of black bristles. 

 Postnotum elliptical, prominent, black, shining, usually nude, sometimes with 

 one or more minute setse close to posterior margin. Pleurae and coxae blackish, 

 nearly solidly clothed with silvery-white flat scales ; setae minute, dark. 



Abdomen subcylindrical, somewhat compressed at base, sixth and seventh 

 segments apically expanded beneath, eighth segment tapered posteriorly ; dorsal 

 vestiture of metallic, shining blue and purple scales, a basal silvery band on 

 fifth, sixth and seventh segments, a series of large, lateral, triangular, seg- 

 mentary, basal silvery-white spots ; first segment metallic violet-blue scaled in 

 the middle, silvery at the sides, with some small dark hairs ; venter violet-blue 

 scaled, Avith broad basal silvery bands, except on last two segments. 



Wings moderate, hyaline ; petiole of second marginal cell shorter than its cell, 

 that of second posterior cell somewhat longer than its cell; basal cross-vein 

 distant more than its own length from anterior cross-vein; scales brownish - 

 black, the outstanding ones narrowly ligulate, denser and broader on forks of 

 second vein. Halteres white, the knobs black with silvery-white scales at apices. 



Legs slender and rather long; vestiture black with metallic violet-blue re- 

 flection, the scales somewhat raised and roughened on apical part of tibia and 

 on first tarsal of hind legs ; trochanters silvery-whitish ; middle femora nar- 

 rowly silvery beneath to apices ; hind femora silvery beneath and on outer side 

 of basal halves. Claw formula, 0.0-0.0-0.0. 



Length : Body about 4 mm. ; wing 3 mm. 



Male. Proboscis nearly straight, rather long, violet-black scaled. Palpi as 

 in the female, short, one-sixth the length of the proboscis. Antennse plumose, 

 the last two joints long and slender, rugose, pilose, black, the others short, pale, 

 broadly ringed with black at insertions of hair-whorls; hairs of whorls long, 

 fine but rather sparse. Coloration similar to the female. Abdomen slender. 



