JOBLOTIA DIGITATUS 179 



Length : Body about 6 mm. ; wings 5 mm. 



Male. — Palpi nearly as long as proboscis, slender, uniform, with a few out- 

 standing setae towards the tip. Antennae with the two last joints long and slender, 

 rugose, pilose, black; the others short, yet over twice as long as wide, whitish, 

 with narrow, irregular black rings at insertions of hair-whorls ; hairs long, dense 

 plumose, black. Coloration as in the female. Wings hardly narrower than in 

 the female, the stems of the fork-cells longer, basal cross-veia beyond the 

 anterior, vestiture somewhat less abundant. Claws simple, large and unequal 

 on the front and middle legs, small and nearly equal on the hind ones ; formula, 

 -0.0-0.0-0.0. 



Length : Body about 6.5 mm. ; wings 5 mm. 



Genitalia (plate 7, fig. 43) : Side-pieces conical, over twice as long as broad, 

 simple, without projections. Clasp-filament long and slender, with an inserted 

 terminal spine ; a rounded lobe at extreme base of side-piece within, bearing a 

 number of long setae. Harpes flat, tapering to tip, inner margin revolute, apex 

 concave, with a row of short teeth. Harpagones absent. Unci forming a low, 

 broad triangular plate. Basal appendages represented by a transverse row of 

 stout setae. 



Larva, Stage IV (see figure of the entire larva, plate 47) . — Head subquadrate, 

 side angles roundedly prominent, forming a right angle between posterior edge 

 of occiput and lateral margin behind the antennae; a flattening at base 

 of antennae; front margin feebly arcuate. Antenna small, cylindrical, imi- 

 form, smooth, the terminal digits stout and equal in length, a single hair 

 beyond middle. Eye smaU, round. Head-hairs all single. Mental plate tri- 

 angular, a terminal tooth and seven on each side, the basal ones more pointed 

 and more remotely placed. Mandible quadrangular, outer margin oblique, 

 dentition terminal; a filament before tip arising from a rounded notch; a short, 

 curved outer row of cilia; dentition of five large teeth, the second longest; a 

 cordate tooth below in a sinus, the upper edge of which is vertical, vrith a tuft of 

 small hairs; no hairs below. Maxilla short, irregular, without visible suture; 

 inner half with a subapical thorn-shaped prominence ; a central row of hairs ; 

 paired filaments terminal ; a tuft of hair on the angle next the palpus. Palpus 

 long, nearly reaching tip of maxilla, with four short apical digits. Thorax 

 quadrangular, roimded at corners, wider than long; hairs moderately long, less 

 tufted on mesothorax. Abdomen moderate, elongate, the segments subequal, 

 monilif orm ; hairs very long, lateral ones double on first three segments, single 

 on third to sixth, diminishing somewhat posteriorly; short hairs well developed, 

 single. Tracheal tubes moderately broad, band-shaped, fiexuous, uniform. Air- 

 tube stout, slightly tapered, twice as long as wide, without pecten ; a single large 

 hair tuft before the middle. Eighth segment with a stout seta from a large 

 tubercle ; no comb. Anal segment as long as wide, expanded outwardly, dorsal 

 plate three-fourths inclosing segment; dorsal tufts of four long hairs; a single 

 long lateral hair at angle of plate ; subventral tuft of two long hairs, connected 

 by a curved chitinous band with its fellow on the other side. Anal gills large, 

 broad, twice as long as the segment, with central branched tracheae. 



The eggs are laid in rafts, according to the observations of Mr. Jennings, who 

 preserved a female which he had observed in the act of oviposition. Mr. Knab 

 collected the larvae in numbers in some coeoanut-husks at Izalco, Salvador, in 

 1905. These husks contained only the larvae of Joblotia digitatus, with an 

 occasional Megarhinus moctezuma preying upon them. In these locations he 

 found several egg-boats, the larvae from which were not bred. About 100 eggs 

 in each circular raft, standing upright, of a light gray color, the raft flat, not 

 curved at the sides. Single egg cylindrical, nearly alike at the two ends, which 



