Descriptions of Tertiary insects / by T.D.A. Cockerell.

  • Theodore Dru Alison Cockerell
Date:
1908
Catalogue details

Licence: In copyright

Credit: Descriptions of Tertiary insects / by T.D.A. Cockerell. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    13/18 (page 311)
    The Neinestrinids are divided into two groups,—those witli, and those without, an elongate proboscis. Dalembolus flori- gex'us Scudder, described many years ago, from the Florissant shales, belongs to the first i>-roup: the two fossils now before me belong to the second. It is not possible that either of the latter represents Dalemhohis with the proboscis broken off or concealed, as the venation does not by any means accord with Scndder’s description. I saw the type of Palemholus in the Museum of Comparative Zoology last summer, but, as 1 now much regret, 1 made no detailed examination of it. The new fossils are :— (1) Hirmoneura melancleri n. sp. Miocene shales of Floris- sant, Colorado, Station 14 ( IF. D. Cockerell., 1907). Length about 15-I'', with the apical segments of the abdomen ex- tended, so that the chitinous rings are separated; body black, wings hyaline, slightly dusky; width of head 3f; of thorax 5™“; of abdomen about middle 4^”™ ; length of wing 10'“. JN^amed after Prof. A. L. Melander. Ilolotype in Yale University, (2) Hirmoneura molcanica n. sp. Miocene shales of Floris- sant {Mrs. Charlotte Hill). In Yale University Museum. Smaller and more slender ; length about 12'“ ; head and tho- rax at least mainly black ; abdomen dark brown (probably reddish in life), the hind margins of the segments having broad entire light bands, about one-third the width of the segments and extending more or less forwards at the extreme sides ; a fine dark line borders the extreme hind margins ; width of head and thorax each about 3““; of abdomen about middle 4““ ; wings hyaline, very faintly dusky, 11““ long. The wings are much longer in proportion to the insect than in H. melan- deri. Ilolotype in Yale University Museum. Palemholus jiorigerus is 19““ long, with wings 12““ ; pro- boscis 12-^““. In describing the venation 1 compare the fossils with three living species :— (3) Hirmoneura clausa Osten Sacken. Texas. This is the species figured in Comstock’s Manual, p. 460, as Tiynchoceph- alus sackeni. I am indebted to Professor A. L. Melander for the correction. , (4) Hirmoneura B. A new species from Texas, of whicli I have the drawing of the wing, very kindly furnished by Prof. Melander. (5) Nemestrina A. An undescribed species from Turkestan, of which a figure has been kindly sent by Prof. Melander. The Nemestrinids are to-day comparatively numerous in Turk- estan and the adjacent regions, although so rare in North America. The wing-characters may be best understood if taken one by one:— (1) Costal cross-vein is barely beyond u])per insertion of first radio-medial cross-vein in Hirmoneura B. and H melan-