Hood—Studies in Tubidifcrous TJnjso, turpi era. 
IGl 
there, I am unal)le to say. In the instance in which I noticed them 
particularly, they occurred upon a yonnf>: shag-hark hickory in tluMnonth 
of September, (dnite a number of the leaves had oiu' and several had 
two or more galls growing upon them, in each one of which was one or 
more of these insects or their larva*. The galls w(‘re of a very tough 
leathery texture, green where they adjoined the leaf and deep i)nrple at 
their ends, though most of them at that date had become dry and faded 
to a dark brown color. The leaf is often wriid<led around the gall and 
has more or less of a fold extending from thence to its outer edge. The 
insect within, when disturbed, turns its tail np\vard over its 1)ack in a 
menacing manner, the same as the rove heeth's (Staiihyliituhe) do; and 
when the })oint of a needle which has been pressed upon one of these 
insects is touched to the tip of the tongue, unless my imagination greatly 
deceives me, it wdll frequently be found to impart a peculiar acrid luting 
sensation. This insect is 0.07 long, of a deej) black color and highly 
polished. Its head is narrower than the thorax and nearly square. The 
third, fourth and fifth joints of the anteniue are longer than the others, 
yellow and slightly transparent; the last joint is shortest and but half as 
thick as those winch precede it. The abdomen is egg-shaped with its 
tip drawn out into a tube thrice as long as it is thick, with four long 
bristles at its end. and the abdomen is furnished with bristles at each of 
its sutures. The wings do not reach the tip of the abdomen. They are 
white and slightly transparent and fringed with black hairs. In its larva 
state it has a more slender linear form with a dull greenish yellow* head, 
a white thorax with a broad black band anteriorly, a pale red alxlomen 
with a black band at its tip, and w*bitish legs. 
The description quoted above of the adult insect is not sntlicientlj* de¬ 
tailed to distinguish it readily from the many other species of the genus 
which have been diagnosed in recent years. The follow'ing should enable 
it easily to be recognized: 
Female .—Length about 2.0 mm. dolor dark blackish lirown or lilack; 
tarsi and articulations of legs paler; antennal .segments o-G largely yelhuv 
in basal portions. 
Head about 1.14 times as long as wide, broadest just behind eyes; 
cheeks gently arched, slightly convergent ])Osteriorly; vertex truncate, 
not at all produced, abruptly declivous, the anterior ocellus distinctly 
overhanging; dorsal and lateral surfaces deejily an<l closely roughened 
witli transverse lines and set w'ith several short s])ines; ])os.tocular 
bristles pointed, about as long as eyes. Eyes about one-tbird as long as 
head, not protruding. Posterior ocelli opposite line drawn behind 
anterior third of eyes. Antenme twice as long as head, form and structure 
well shown in lignre (PI. 4, fig. G) ; sense cones small; formula; d, 0-1; 
4 ^ 1-2-f'; 5, 1-1-f'; G, 1-1 4-'; 7 with J on dorsum near apex. Color of 
antennre: Segments 1 and 2 nearly concolorous with head, 2 yellowdsh 
apically; G nearly clear yellow, usually infuscate in apical third; 4-G 
yellowish, successively darker in color, irregularly niarl)led wdth brown 
apically; 6-S uniform blackish brown or with pedicel of 7 paler. Mouth 
cone subacute, nearly attaining base of prosternnm. 
Prothorax about .G as long as head and (inclusive ol coxa*) nearly 2.5 
times as wdde as long; all bristles present, pointed, unu.^^ually long for 
the genus, the two pairs at the posterior angles nearly as loiig as pro¬ 
thorax; other bristles about halt as long; coxal bristle pointed, sill 
