346 



gins of dorsal segments except the apical 3 with numerous short setulae 

 which are irregularly arranged ; ventral segments with similar setulse, 

 which are arranged in distinct transverse series which extend well on 

 to the disc of the segments; antepenultimate segment with a large 

 transverse patch of these setulae on disc (PI. LXXXIII, Fig. 16). 



Pitparium (PI. LXXXIV, Fig. 13). — Length, 4 mm. Yellowish 

 brown. Anterior respiratory organs absent. Segments with similar 

 armature to that of larva. Apical segment armed with 2 sharp proc- 

 esses which pierce the outer membrane of the leaf in which the 

 puparium is enclosed, and connected with these processes, which are 

 evidently the posterior spiracles, are 2 tracheae which run forward and 

 presumably connect with the pupal envelope, although the point of 

 connection is not discernible in the specimen before me. 



The above description was drawn from specimens obtained by Mr. 

 Hart and the writer at Grand Tower in April, 19 14. The larvae were 

 mining the leaves of a species of Panicum growing in a small stream, 

 many of the mines being below the water level. 



Two specimens of a hymenopterous parasite were reared, both 

 males. One specimen was submitted to Mr. A. B. Gahan, who identi- 

 fied it as Gyrocampa, n. sp. He considered it inadvisable to describe a 

 new species from the male only. 



Scapularis is generally distributed throughout the state. There is 

 a previous record of the larva mining leaves of Hordeum by Webster 

 and Parks.* Several European species of the genus have been record- 

 ed as phytophagous, but so far this is the only North American species 

 on record. 



DROSOPHILID^ 



The imagines of many species of Drosophila are numerous 

 throughout Illinois during the greater portion of the year, and may be 

 seen in large numbers on the inside of windows of fruit-stores and 

 delicatessen stores, as well as in cafes and restaurants, where they are 

 readily detected, flying over various foods, by their slow and steady 

 flight. The principal food of the larvae consists of decaying vegetable 

 matter, exuding sap on trees, and fungi. A few species are found 

 mining leaves of cruciferous plants, and several attack injured fruit. 



I am unable to indicate characters for distinguishing the larvae of 

 the family from allied acalypterates because of the paucity of my ma- 

 terial. The larvae vary very considerably within the genus Drosophila 

 as at present limited, and the puparia vary even more in structure ; in 

 fact there is more difference between the pupae of certain species of 



*Jour. Agr. Eesearch, Vol. 1, 1913, p. 84. 



