EXPERIMENT STATION BULLETINS. 



251 



rudimentary lobes ; median lobes broad, rounded, with a deep notch at about one-third 

 the distance from the distal margin. Laterad of the median lobes are two pairs of 

 incisions in the body wall with thickened edges, and laterad of each of these is a rudi- 

 mentary lobe. • 



There are a pair of inconspicuous, simple plates between the median lobes, also a 

 pair of broad, short, simple plates caudad of each of the incisions. Sometimes these 

 plates opposite second incision are serrate on outer side, there being five or six teeth 

 on a plate. 



The spines are situated as follows: One pair on lateral margin of median lobes, one 

 pair between first and second incisions, one pair laterad of second incision, one pair 

 half way from median lobe to penultimate segment and one spine about one-fifth the 

 distance from penultimate segment to median lobes. 



There are five groups of spinnerets. Posterior laterals, 6-10; Anterior laterals, 6-9; 

 Anterior, mesals, 1-5. Laterals in oval patches. 



Fig. 4. European Fruit-scale, Aspidiotus ostrecBformis, last segment of female. (Original.) 



THE APPLE LEAF-MINER. 



(Tischeria malifoliella, Clem.) 



Toward the close of the past season, an examination of a great majority of the apple- 

 trees in the vicinity of the Agricultural College would have revealed the presence 

 of mines in the leaves. Ligiit colored patches on either the upper or lower surfaces 

 were not uncommon. These patches, when torn open, showed the spot to be merely a 

 blister-like space where the soft fresh tissue of the leaf had been eaten out by a small 

 caterpillar working between the upper and lower skins or epidermises. Such mined 

 leaves were not uncommon in Ingham county and at South Haven they were found to 

 be very numerous. 



The larvae are said to change to the pupal condition during September, and to remain 

 in that condition until the following May. At the time when they were examined, Sep- 

 tember 6, the larvae were in a full-grown condition, and ^Ir. Fulton, the Superintendent 

 of the Sub-station, informed me that they were in a similar condition about the middle- 

 of July. This would indicate two broods a year. When made in apple leaves, the mines 

 are irregular in form and rarely exceed three-quarters of an inch in size. The young 

 caterpillar just from tlie egg, constructs a very small thread-like channel, which gradu- 



