46 MISC. PUBLICATION 42 4, U. S. DEPT. OF AGRICULTURE 



Second stage. — Resembling adult female, but smaller ; margin with 8-shaped 

 pores mostly in a single row, but in an irregularly double row at a few points ; 

 quinquelocular pores less numerous than 8-shaped pores, disk pores fairly sparse 

 dorsad of, and very sparse ventrad of, 8-shaped pores ; dorsal surface with a few 

 8-shaped pores arranged in 4 or 5 transverse rows, minute 8-shaped pores scat- 

 tered, fairly numerous ; ventral surface with around 12 quinquelocular pores in 

 each spiracular pore band, 2 or 3 disk pores on abdomen ; apex of abdomen as 

 in adult but all setae about one-third shorter. 



Larva. — Elongate ovoid. 



Margin : With 28 8-shaped pores, the posterior 6 pairs slightly smaller than 

 the next 7 and the anterior pair slightly larger than any others, axes of the 

 posterior 6 pairs transverse, axes of others longitudinal ; a pair of setae close 

 to each of the posterior 3 pairs of pores ; 4 pairs of setae anteriorly. 



Dorsal surface : 8-shaped pores in a submedian row of 9 or 10 on each half 

 of body, anterior 3 pairs usually slightly larger than the others, of practically 

 same size as marginal pores of same segments ; disk pores near margin, and 

 1-3 near submedian 8-shaped pores ; a pair of setae near anterior pair of 

 8-shaped pores. 



Ventral surface : Antennal setae, I, 2 ; IV, 1 ; V, 1 ; VI, 2 long, 2 stout, 3 fairly 

 stout, 2 slender ; antennal bases one-fifth length of antenna apart ; beak setae, 

 2 pairs apical, 1 pair basal ; each spiracle with 2 pores, usually 1 quinquelocular 

 and 1 trilocular at anterior spiracle, and 2 trilocular or a trilocular and a 

 quadrilocular at posterior spiracle ; leg setae, coxa 4, femur 1 on inner margin 

 near base and 1 each on inner and outer margins near center, tarsus 2 on inner 

 and 1 on outer margin ; tibia one-half as long as tarsus ; 7 pairs of submarginal 

 8-shaped pores, none of which are between the antennae ; 8 pairs of submarginal 

 minute setae, on abdomen and thorax, 3 pairs of submarginal larger setae at 

 anterior end ; 3 pairs of setae between antennae and mouth parts. 



Apex of abdomen : Truncate or slightly concave ; lobes barely or not indicated ; 

 setae, apical 118-126 fx long, interapical about 21.6 t* long, dorsal about 5.4 n long, 

 inner ventral 5.4-6.8 n long, intermediate ventral 9-10.8 n long, outer ventral 

 10.8-12.6 \i long ; anal ring with 6 setae 28.8-30.4 fi long, and with an inner row 

 of 6 and an outer row of 14 pores ; ventral surface of apex membranous or 

 slightly sclerotized near inner ventral setae. 



Data. — Redescribed from 1 unmounted specimen, 1 moimted female, 

 and 58 mounted larvae on Arabis stricta, Montpellier, France, from 

 the Signoret Collection, loaned by M. Beier, probably type material of 

 arabidis; 3 mounted females and 5 mounted larvae, labeled hederae, 

 from the Lichtenstein Collection, loaned by P. Vayssiere, probably 

 type material of hederae; 1 unmounted specimen and 1 mounted female 

 on Thesium hwnifustim, The Rectory, Corfe Castle, Isle of Purbeck, 

 E. R. Bankes, July 12, 1892, type specimens of thesii, loaned by F. 

 Laing; unmounted material, 1 mounted female, and 1 mounted larva 

 on Hedera helix, northern Italy, Chermotheca Italica IV, No. 76 ; un- 

 mounted material, 2 mounted females, and 1 mounted second-stage 

 Decimen on Pittosporum tobira, Varazze, Liguria, Italy, O. Jaap, 

 x nuary 24, 1913; 1 unmounted specimen, 1 mounted female, and 8 

 7 ae on Hedera sp., Naples, Italy, from F. Silvestri; 1 mounted 

 le on Pittosporum sp., Italy, intercepted at New York, April 18, 

 unmounted material and 1 mounted female on Hieracium u/mbel- 

 Znaim, Moravia, Czechoslovakia, loaned by M. Beier; a mass 

 ^inted material, 116 mounted females, 3 mounted second-stage 

 \ and 8 mounted larvae bearing the following data : Lechea 

 rmel, Conn., W. E. Britton, July-September 1925 ; Panax 

 w, W. Va., O. M. McDonald, September 1926; Fmxirms 

 ' lanceolata, Pa., F. M. Trimble, February 1927; Osmo- 

 \ St. Thomas, Pa., F. M. Trimble, March 1927; Phlox 

 and Phlox sp., Brookline, Mass., Olm stead Bros., July 

 Pa., Mrs. J. V. Cook, August-September 1930; Phlox 

 tsl, C. W. Collins, August 1930; Phlox divaricata, 



