66 SIXTH ANNUAL REPORT 



APPENDIX. 



(1) 'J'he present Minister of Agriculture and Commerce has quite recently placed 

 a special resource of 20,000 francs to the credit of the Academy of Sciences at Paris, to 

 defray expenses of studies and experiments to be made in 1874 under the directions of 

 said Academy. 



(2) The followino- specific diagnosis of the mature forms, drawn up from our 

 American insect, (thousands examined), will, I hope, forever quiet the skepticism of 

 those who believe it diflerent from the European species, by enabling them to make the 

 most careful comparisons. The immature characters have been sufficiently detailed in 

 the text : 



DIAGNOSIS OF PHYLLOXERA VASTATKIX. 



Type 1. Galla'cola {vitlfolice. Fitch)— 



Average length 0.04 inch ; nearly as broad. Form broadly ovoid. Surface 

 granulated, superiorly with rows ot short haii-s in place of the tubercles ot 

 Type 2, inferlorly with three pairs of pale, tleshy, medio-ventral tubercles between 

 the legs, the anterior pair smallest, and three dusky and but slightly raised sub- 

 ventral warts each side, just outside the legs, (two of them between the first and 

 second legs, the first nearly equidistant between them, the second close to second 

 leg, and one between the second and third legs). Members short and imperfect, 

 the anteiin:e granulated and with but one corneous plate, more or less circular in 

 form, and near the tip. Eyes composed of three simple eyelets. Tarsi imper- 

 fectly 2-jointed, the digituli imperfect ; the claws more or less imperfect and not 

 horny. Color of body dull orange-yellow; more dusky at upper anterior end- 

 Legs, anter.niio and proboscis more dusky, inclining to black. Insections of 

 thorax imperfect. (Fig. 4,/, g, h.) 



Type 2. Radiciaola — 



a. Degraded or Wingless Form. — Differing from the preceding only in the 

 somewhat stouter members, more pyrifonn body, and in having superiorly series 

 of more or less distinct warts or tubercles, which, like the members, are more 

 dusky than the general color of the body. The body is more or less distinctly 

 insected and tubercled superiorly as follows : The head forms one division and 

 has 10 tubercles — 4 mediodorsal and quadrangularly arranged, 3 lateral and 

 arranged around the eyelets, one of them usually subobsolete ; the prothorax is 

 more or less distinctly divided transversely in two, with G tubercles in a transverse 

 row in each division, (or 12 in all), the second from outside more or less obsolete ; 

 the mesothorax with 8 tubercles, 4 dorsally in a transverse line, and 2 lat- 

 erally in a longitudinal line ; metathorax distinctlj^ divided in two — the first half 

 with 8 tubercles as on the mesothorax, the second with 6 as on the prothorax, or 

 14 in all; the abdomen with 7 joints and a subjoint, and each joint with but 4 

 transverse tubercles, except the 7th. on which they are either obsolete or form but 

 a dusky mark. Besides these tubercles, there are on each of the thoracic insec- 

 tions about more or less distinct dark point', and 2 or more on the head ; 



