52 ENTOMOLOGICAL NEWS [Feb., 'll 



ing of the shrunken condition of some parts, e. g. the tissues 

 represented in figs. 20 and 25. 



There thus have been available for the present description four 

 larvae which may be designated as follows : 



No. I. $. Peralta as above, total length including antennae and 

 caudal gills 16.5 mm.; length of body excluding the parts named 11.5 

 mm. 



No. 2. $ . Juan Vinas, May 2, in fragments. 



No. 3. $. Juan Vifias, May 2, measurements as above, 20.5 and 17 

 mm. respectively. 



No. 4. 9 . Juan Vinas, May 2, measurements the same as those 

 of No. 3. 



No. 3 has furnished dissections of internal organs. Nos. i and 4 

 have been kept almost intact. 



DESCRIPTION OF THE LARVAE. 



Head deeply concave posteriorly (Plate III, fig. 21) for reception 

 of the prothorax. Compound eyes and ocelli distinct. Six pale yellow- 

 ish spots indistinctly visible on the upper surface of the head, two in 

 front of the median ocellus, one anterior to and one posterior to each 

 lateral ocellus ; some of these spots wanting in some specimens. 



Antennae 7-jointed, but the last joint only visible under the com- 

 pound microscope (PI. II, fig. 10) ; ratios of the lengths of the joints, 

 in a detached antenna under a cover-glass. 21, 26, 17, n, g, 5.5, 3; 

 joints i to 6 successively decreasing in thickness; joints i and 2 clothed 

 with a dense pile, which is longest in larva No. i, and consists of flat- 

 tened scales as shown in fig. 5. A similar pile is found on many other 

 parts of the body, such as the anterior margin of the nasus, the lateral 

 margins of the head posterior to the middle of the compound eyes, 

 margins and ridges of the thoracic and abdominal segments, of legs and 

 of wing-pads, a transverse ante-apical line on abdominal segments i-io 

 for the entire width of the dorsum, much of the surfaces of the caudal 

 gills, etc. This pile is longer and more conspicuous on larva No. i than 

 on the other three. Joints 3-7 of the antennae have a decreasingly 

 smaller amount of pile. 



Mandibles stout two-branched, external branch larger, its apex with 

 five teeth, first two teeth, counting from the dorsal margin, less distinct 

 from each other than are the other three, fourth tooth longest. In- 

 ternal branch in larvae Nos. i, 3 and 4 larger on the left mandible than 

 on the right mandible (right mandible lacking in larva No. 2) and on 

 the left mandible its apex is truncated and with seven teeth or crena- 

 tions, dorsal-most largest (Plate II, fig. 16). On the right mandible 

 the apex of the internal branch is pointed and has only two teeth. 



