CENOCYTES OF PLATVI'HYLAX DESIGNATUS. 22~ 



cytes, so conspicuous in the early larval stages, occur veiurally 

 in pair-. one on each side of every abdominal segment. The 

 smaller oenocytes of the earlier, as well a- the later larval stages, 

 are found principally in gn>up> of from two to five, the larger 

 ip- appearing uion- ventrad. In -e\ rral specimens they were 

 observed near to or even grouped around a t radical tube to which 

 they, however had no connection. The location of all of the 

 i-ii" is distinctly pleural. 



The distribution of the o-noi \tt-s does not char. ' ntiallv 



\\ith the iin rease in -i/e of the larva-, but there i- a le-s marked 

 tendeiK \ for them to occur in Croups. \\'ith the increase in 

 si/e ot the lat-bod\ more of them become partially or compleielv 

 -m rounded by this structure. The-e ch more marked 



in the late larval and in the pupal si but \\e frequently MIN! 



in the :- m.inv as ti\e oenOCytCS, and this 



lendem \ to grouping i- observed even in the ima^inal sta 



\ i aivlul < ounl ot tl;, a lar\ a eijit millimeters in 



length totals about one hundred and t\\eitt\-ti\ . the-e bein- 

 ap|iro\imat-l\ ei|ii.ill\ 'itioncil lie! \\een tin H'Jit and left 



sitle- of the bod-. I 'her estimates it i- '..mid that this 



number i- about iv; I h. n seems 



to be no \\ide tin- tuation in numbers in dillerent |>etiods nf the 

 li|e-|iisio|-\ , though the ima^inal stages appeal to ^}\<>\\ a d' 

 in niimbi ;he lar\al, due perha|>- to disinuvrat ion. The 



loiulusioii that the numbei is con-taut lor all the larva- of the 

 -an i I belie\e. hardlx ju-l iliable, but there is no \\ide 



\aiiatioii in tin I. In no case. ha\e I s,-,-n evidences of 



di\ is'i .11 eitlu-r b\ mito-i- . .r a mi to- is in an\ ol the stages si udied. 

 nor an in in numb-r in later larval, pupal or imaijnal 



.\ ei that in the earlier lar\ al perioiU. 



\\hile the u-iio. .ppear practically constant in number 



lhroui;hoiit the >tai;es examined, there is to be noted a \ ery 

 matked increase in tlu-ir - th- lar\a advam< .routh. 



The lollouin^ tabli- tcprcsent- the >i/,- ,,f an average oencx 



derived from measiireineiii - of several ol these celU in the 



indicated. 



The lame-i sj/i- ,f tin- oenocytes is reached in the pupal stage; 

 the greatest lenuih of the nucleus, proportionate to ihat of the 



