THE RED SPIDER ON COTTON. 49 
Several larve of this midge of various sizes were collected in the 
field and reared to adult on mite eggs and mites. Table XVIII pre- 
sents the data which bear on the larval period. 
Taste XVIII.—Duration of the larval stage of Arthrocnodax carolina, Batesburg, S. C. 
: Interval 
Individual No. eEyaree Condition at collection. Pupated. 1 ouHcok 
pupation. 
| Days. 
Te ee lee re ea Sepiey2s- 09140 One-haligrowness. 2... 22g (B@Ctaelis tessa! 3 
OD). Fa Sens sige: ara eae DURST iS Ls ee eee econ ere els Ocho ews) 2 
Sip i ana Oe 2s. eet GOs eats CLO tiie 2 eae) Vader ma et Rent tegen MMR zy dos 2 
A, 9 hot ENA Rede Octes Ola MNascenity (Cameos aot ae eer seca ae OG Bese wie 5 
Fein te See eR in cha CLO enya Sim aM. ie oyu ed tas uty Oc iia 3 
(06 oc eee Octal el OMe Maree se aa ce ite lk 2k ERR ee delle ata Se okays 1 
Fi. A Sa aE ees Oct. 1151914 |..... CAG 2 3c" Rae Dy aia UE an ot ae arnt Ocha ews 1 
{Gal ae eee ea Oct 1321914 |) Mwo-thirdsigrown..-..2.2.5256222.222 2... nO CEs ANs a ae 1 
Oo Cee eee Octay2lel QiaaNascentiGh yin ie sass oe he Ocths26suatee. 5 
Le IGE. DE TTON Ce kh ca ee [Os 8 fo EN Se ce Ocw201 ae 3 
Ln oe SS eee Pres Goseeae es matherilance. ven tun el etaee tle ee \ Octyosasn ss 2 
SL Rp ee 2 Octon2 Te IGI4n AN ascent yi uo Mes or envi eS Oe NiO veielia eos 5 
| 
Probable larval period, 5 days. 
From the foregoing records it may be seen that very small indi- 
viduals completed their larval development in from three to five days. 
Since several of these gave every evidence of being newly born at 
the time of collection and had no appearance of having fed, it is evi- 
dent that some of our records represent the entire larval period. 
The larva (fig. 13, at left) is a small, glistening, amber-yellow grub 
with a pointed, protractile head which bears a pair of retractile, 
snail-like tentacles. A series of larvae measured: Length, 1.5 mm.; 
width, 0.33 mm. 
Table XIX includes the completed records on the duration of the 
pupal stage which are available. 
TaBLeE XI X.—Duration of the pupal period of -Arthrocnodax carolina, Batesburg, S. C. 
dnd | Larva | Adult | Pupal 
Novn Ee pupated. | issued. | period. 
| Days. 
Vee eens heOct. 182) /Octit 7 
Die i tS ate Oct. 10.| Oct. 18 8 
eg See | Oct. 11.| Oct. 19 8 
Ly eee exons. Oct. 20 9 
Be ets ie @Octei22) Oct. 21 9 
Geeta sie Ousnel Oct. 20 8 
Average pupal period, 8.2 days. 
The data contained in Table XIX obtained from October rearings 
indicate that the pupal period of this predator under summer condi- 
tions does not exceed eight days, and at times may be a trifle less. 
