68 MAINE AGRICULTURAL EXPERIMENT STATION. 1917. 



elevated ; median line of prothorax and metathorax slightly ele- 

 vated but not carinate; abdomen coarsely punctate, the punc- 

 tures larger along the cephalic margin of each movable segment, 

 and with scarcely any other markings ; furrow between segments 

 nine and ten edged with black, the teeth coarse and largest near 

 the meson ; caudal margin of furrow elevated ; eighth and ninth 

 abdominal segments always punctate ; cremaster usually with 

 two short spinous projections on each half. 



Length about 23 mm. varying but little; greatest width 7 

 mm. 



Most larvae of Datana ministra have been collected from 

 apple in this state, although it feeds on a variety of other trees. 

 The larva enters the ground to pupate. It spins no cocoon, but 

 forms an earthen cell in which silk threads are seldom present. 



Genus SYMMERISTA Hiibner. 



Head distinctly narrower than the thorax; body surface 

 punctate, even on the appendages, though presenting a polished 

 appearance, and without impressed lines or other markings; 

 clypeal region slightly elevated; invaginations for the anterior 

 arms of the tentorium very distinct ; labrum almost semicircular 

 in outline; glazed eye-piece one-fourth the width of the sculp- 

 tured eye-piece and bounded mesally by an impressed black 

 line; maxillae about nine-tenths the length of the wings, the 

 tips of the antennae meeting just caudad of them on the mes- 

 on; antennae considerably wider at the proximal end, but their 

 greatest width is not equal to that of the prothoracic leg; pro- 

 thoracic and mesothoracic legs of the usual length, never meet- 

 ing on the meson; wings meeting on the meson for a short dis- 

 tance caudad of the antennae; mesal length of prothorax one- 

 third that of the mesothorax and the metathorax one-fourth of 

 the same length; cremaster short, slightly bifurcate, and bear- 

 ing hooked setae. 



SYMMERISTA ALBIFRONS Smith and Abbot. 

 Fig. 6, A and B. 



Color dark chestnut-brown; mesal half of the genae and 

 a small area adjoining the cephalic margin of the prothorax 



