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THE STATE ENTOMOLOGIST. 177 



Euiu'TOirA Bolteri, N. Sp. — $ Length 0.18. Antennae black, not much longer than the 

 face, perceptibly thicker towards the end, and apparently 10-jointed, though the three terminal 

 joints are almost always confluent. Dimensions and appearance of joints, represented in the an- 

 [Fig. 97.] nexed Figure 97, a. Head and thorax rough-punctured. 



, and finely bearded with short, stiff gray hairs. Abdo- 



-^OcS iC*i.\ men about as long as thorax, scarcely so broad, viewed 



t*? q y\, from above, but wider viewed laterally : highly pol- 



T ^l ished, smooth and black, the three terminal segments 



with minute stiff gray hairs along the sutures ; visibly 

 ^Vj\\, divided into seven segments, the four anterior ones of 

 about equal length, the two following shorter, and the 

 terminal one produced into a point. Legs fulvous with 

 the coxa, thighs and more or less of the shanks black- 

 ish-brown. Wings perfectly transparent, glossy, color- 

 less, and with the nerves very faint. 



(5* Measures but 0.14, and differs in the antennse, being twice as long as the face, in their 

 narrowing towards the tip and in being furnished with whorls of long hairs. The number of joints 

 are not readily made out, and I have consequently presented at Figure 97, b, a magnified figure. 

 His body is but half as wide and half as long as the thorax viewed from above, and not quite as 

 broad as the thorax, viewed laterally; it also lacks the produced point of the $. His wings are 

 also cut off more squarely and more distinctly nerved. 



The third parasite which attacks our gall-maker is represented 

 somewhat enlarged at Plate 2, Figure 7. It is an opaque black fly 

 belonging to the true Ichneumon family and apparently to the genus 

 Hemiteles. After most of the gall-makers have undergone all their 

 transformations and escaped, some few of the galls are found still in- 

 inhabited by the worm. These belated worms contain the larva of this 

 fly, and they are somewhat smaller and paler than are the healthy 

 ones ; their life as worms being prolonged by the presence of their 

 enemy within. During the month of September, the parasitic larva 

 leaves the body of the caterpillar, and spins for itself, within the gall, 

 a tough while silken cocoon, in which it remains through the winter, 

 and from which the fly escapes during the following March or April, 

 some of them escaping much earlier than others. This fly I have 

 named in honor of my friend Mr. E. T. Cresson, of Philadelphia, to 

 whom I am indebted for the generic determination of all these para- 

 sites. 



Hem [teles (?) Cressonii.— $ — Length 0.25. Black, opaque, head transversely-subquadrate; face 

 clothed with pale glittering pubescence ; spot on mandibles, palpi, scape of antennas in front and the 

 teguke, white; eyes large, ovate; antennae longer than head and thorax, slender, black; thorax closely 

 and minutely punctured ; mesothorax with a deeply impressed line on each side anteriorly ; scutel- 

 lum convex, closely punctured, deeply excavated at base ; metathorax coarsely sculptured, truncate 

 and excavated behind, the elevated lines sharply defined, forming an irregularly shaped central 

 area, and a triangular one on each side of it, the outer posterior angle of which is prominent and 

 subacute; wings hyaline, iridescent, nervures blackish, stigma large, areolet incomplete, the outer 

 nervure wanting; legs pale honey-yellow, coxas paler, tips of posterior femora, and their tibiae and 

 tasri entirely blackish ; abdomen elongate ovate, flattened, petiolated, the first segment flat, 

 gradually dilated posteriorly, somewhat shining, and indistinctly longitudinally aciculate; the two 

 following segments opaque, indistinctly sculptured ; remaining segments smooth and shining. 



A fourth parasite, belonging to the same great Ichneumon family, 

 issues from the worm and spins a white silken cocoon, in exactly the 

 same manner as the preceding. From this cocoon at the same season 

 of the year, escapes a fly which is also of very much the same size 

 and appearance, but which belongs to the distinct genus Microgaster. 



12 R S E 



