264 Benj. D. Walsh, on the Insects inhabiting the Galls 



recurrent veins in the normal manner. Length % .16 inch; front wing % .16 

 inch. 



One % , bred August 9 from a cocoon found, July 27, inside the Ce- 

 cidomyidous gall S. brassicoidcs Walsh of the same year's growth ; £ 

 unknown. Distinct at once from Pristiphora rjrossularise Walsh, the 

 the only other described X. A. species, by the 3rd joint of the anten- 

 nae being as long as the 4th, and by the much darker legs. In the 

 structure of the face and clypeus it agrees remarkably. 



COLEOPTERA. 



MAKERS OF PSEUDO-GALLS.— Family Cerambycid^. 



j\ t o. 22. Pseudo-gall inornata. — On Salix longifolia and also 

 on Populus angulata or Cottonwood. A rather sudden swelling on such 

 of the main stems as are .50 — 1.25 inch in diameter, cracking open in 

 two or three deep, irregular, scabrous, brown, more or less transverse, 

 gaping, thick-lipped fissures. This is the appearance presented as early 

 as August and until the following spring- but July 19 nothing is seen 

 but a smooth elongate swelling of the stem, pithy inside, and without 

 any cracks or roughness outside, and undistinguishable externally from 

 the Tenthredinidous gall S. nodus n. sp., in the form in which it oc- 

 curs on the same willow later in the season. Very probably, however, 

 as with many, if not with all Saperda, the larva is at least two seasons 

 in arriving at maturity, and the normal appearance of the pseudo-gall 

 is not assumed till the following season. The insect does not make its 

 way out in spring through the deep cracks of this pseudo-gall, but each 

 bores a hole for himself in the manner usual in this family. The gall 

 on the Cottonwood is absolutely identical with the Willow-gall, and 

 was recognized by myself as such at the first glance. It was found ex- 

 clusively on young sapliugs. In both cases it was perfectly healthy 

 plants that were attacked. Although this pseudo-gall weakens mechani- 

 cally the stem upon which it grows, and to such an extent that it occa- 

 sionally causes the stem to break in two with the wind, yet otherwise 

 the stem never perishes, but on the contrary the wound is gradually 

 healed and overgrown by fresh woody matter. 



Larva. July 19th the larva is .10 inch long, or less, and of a pale 

 color. In the spring when it assumes the imago state it is much larger, 

 and differs but little from other larvai belonging to this genus. 



Pupa unknown. 



Imago. Saperda inornata Say (=S. concolor Lee?) — May 20, 

 1864. I bred 5 specimens from the Willow pseudo-gall and many more 

 subsequently. The following year from the Cottonwood pseudo-gall I 



it :» i 



