BULLETIN NUMBER 23, DECEMBER, 1893. 



81 



more sparse, but longer, on the ventral and anal segments. Dorsally 

 these stiff hairs are directed posteriorly and materially assist in the dorsal 

 locomotion. The legs are honey yellow, covered with similar stiff bristles 

 without definite tarsal claw. They are short, compared with the larvae 

 of Lachnosterna, generallv. Prothoracic segment with a honey yellow 

 horny plate in front of the spiracle, which, as usual, is rather larger 

 than'the al)doininal spiracles. Mandibles short, stout, dark brown, with 

 the left (looking from the dorsum), i-dentate and the right, 3-dentate. 

 Antenna? short, 4-jointed, joints sub-equal in length, diminishing in 

 width, from 1 to 4, maxillary palpi, 3-jointed, joints sub-equal in length, 

 terminal narrowest at tip. Labial palpi, -^-jointed, joint 1 longest, 

 somewhat swollen at tip and bearing a short poiuted joint 2-, on the inner 

 side of its tip. Labium covered with short stout bristles. Maxilla? with 

 long, stiff bristles on the inner surface and Avith two long, sharp, black 

 teeth near the tip. 



The half-grown larva does not differ in structure or coloration. 



CABBAGE W0EM8. 



Six different species of caterpillars or worms, affect the Cabbage 

 very commonlv, in the state of Maryland. All feed upon the outer leaves, 

 often boring well into the head. They are known 

 by the following names : The Imported Cabbage-worm 

 (larva of Pieris rapa L.), the Cabbage Plusia, {Plusia 

 brassicce Eiley), the Cabbage Mamestra, {Mamestra 

 trifolii Rott. ), the Zebra Caterpillar, (larva of Mamestra 

 pitta Harr. ), the Cabbage Evergestis, {Evergestis riiiwsalis 

 Gn. ), and the Cabbagenutella or Diamond-back Moth, 

 {Plutella i-nicifcrarum L.). All of the insects will be 

 found treated at some length in my annual report, as 

 Entomologist to the U. S. Department of Agriculture, 

 for 18«3, to which I would refer those who care to go 

 into the details of the subject. For the purpose of 

 — -\^ this bulletin, it is my desire to dwell principally on 

 3jX'l'iarviJ';"J'hry-the facts of practical value. 

 sails, 



The Imported Cabbage Worm {^Picris rapa;), is a pale green 

 caterpillar, about 32mm. (one and a quarter inch) long when full-grown, 

 (Fig. 7, a). It is very finely dotted with black, has a faint yellowish 

 line down its back and a row of- yellow dots along each side. It 



Fig. 8 — P(c/i,s Kfyxt. male 



Fig. 9.— Pieris rapa', female; 



