Vol. xxvi] 



ENTOMOLOGICAL NEWS. 



439 



and left subanal plates. The chief evidence for the entrance 

 orifice, which was not closed, was the behavior of a mass of 

 flocculent substance, a little larger than the aperture, which, 

 when placed over it, was rhythmically sucked inward. 



A second, female, larva (body length, excl., etc., 20.5 mm., 

 median caudal appendage 7 mm., lateral appendages 8.5 and 9 

 mm.) was placed on its back under the same conditions and 

 similarly examined, carmine particles being sprinkled on the 

 water ; 40 anal expulsions per minute. In this case, however, 



Text-figure 1. Ventral view of hind end of the abdomen of a female larva of Calof>- 

 tervx maculata Beauv. From specimen 12 mm. long (excl. antennae and caudal gills) 

 preserved in alcohol. The arrows show the direction taken by currents of water, as 

 indicated by carmine particles suspended in the water, under the conditions described in 

 the text, page 438. x 34. 



ea, aperture between the subanal laminae, sf>/, sf>/, and the hind margin of segment 

 10; gp8, gonapophyses (ovipositor) of the 8th abdominal segment; ff/>9, gonapophvses 

 (genital valves) of the 9th abdominal segment ; leg, left caudal gill ; mrif, median caudal 

 Rill; rcg, right caudal gill; sa, superior appendages of imago (cercoids); sbl, subanal 

 lamina; sf>!\ supra-anal lamina; xa, aperture between the supra-anal lamina and the 

 subanal laminae. In this figure the apertures <-a and xa are shown as continuous, as llu \ 

 are in the preserved specimen from which the drawing was made. In the living larvae 

 described in the text, these two apertures were separated from rarh otlu-i 1>\ the appi o-.i 

 mation of the subanal laminae, but intetnally each communicates with the rectal cavity, 

 ix, x, ninth and tenth abdominal segments. 



