Jan., '08] ENTOMOLOGICAL NEWS. 25 



each of which is composed of from 12 to 16 scales, arranged in an 

 irregular, partly double row. The individual scale (Fig. 10) is lanceo- 

 late with a long apical spine and fringes of small spines at the sides. 

 The ninth segment is somewhat variable in length, but is always longer 

 than broad and is completely encircled by a light brown chitinous 

 ring. The ventral brush is normal, but the dorsal hair tufts are four 

 in number instead of the usual two. The anal gills are slightly longer 

 than the width of the ninth segment and are supplied with obvious 

 trachea. The breathing tube (Figs. 8 and 9) is a highly -complex organ 

 representing an extreme modification of the ordinary anal siphon. 

 In color it is pale brown with the extreme base and apical half strongly 

 infuscated. From a dorsal aspect (Fig. 9) it is bottle shaped* with 

 the basal half greatly dilated. From the side the apical half curves 

 slightly dorsally and two long blade-like spines arises from large 

 papillse situated on a distinct dorsal offset. The constricted portion 

 of the tube is provided within with projecting flaps which appear to 

 hold the inner chitinous tube in position. The apex of each lateral 

 set of flaps is furnished with six horizontally extended hooks. The 

 inner tube, to which the tracheae are attached at its base, is a compli- 

 cated structure in itself, being composed of several distinct pieces. A 

 small elongate piece forms the ventral wall while another much larger 

 piece extends curvedly from one edge to the other. From the apex 

 of the tube thus formed extend two small tubular structures terminated 

 at their apices by an articulated, irregular, corneous piece which, by 

 the action of the long, somewhat chitinous piece coming from the 

 interior of the eighth abdominal segment is capable of being thrust for- 

 ward and horizontally outward. Another separate little piece on the 

 dorsal side of the main inner tube has a serrated edge which is plainly 

 seen from a side view of the entire siphon. 



EXPLANATION OF PLATES. 



PLATE III. 



Fig. i, egg-boat of Culcx perturbans; 2, position of egg-boat on water 

 when supported by a grass stalk; 3, young larva just out of egg; 4, 

 antenna of same ; 5, mandible ; 6, mentum witli hypopharnyx ; 7, anal 

 siphon; 8, lateral patch of scales; 9, method of attachment of the 

 larva to a grass root : all more or less enlarged : original. 



PLATE IV. 



Fig. I, well grown larva; 2, head, showing position of hair tufts; 3, 

 antenna ; 4, portion of same enlarged ; 5, mentum ; 6, mandible ; 7, 

 maxillary palpus; 8, caudal segments of larva; 9, anal siphon; 10, 

 single scale from lateral abdominal patch; all much enlarged: original. 



* The drawing was made from a balsam mount and is consequently much broader and 

 and the outline distorted. 



