April, ’89.] history society of Wisconsin. 
213 
when young, head terminating anteriorly in two conical brown horns 
close together at their bases, but slightly divergent at their tips; 
in front of these, in a line with the upper margins of the eyes, is 
another pair of similar but much smaller projections; anterior to 
which, again, there is in the median line between the eyes, equidistant 
from their upper and lower margins, an unpaired minute projection. 
Tips of the prothoracic legs posterior to tips of the mesothoracic legs by 
one half a tarsal joint; metathoracielegs extending back further by onetai - 
sal joint then the mesothoracic legs. Segments of abdomen strongly pro¬ 
nounced, each bearing dorsally three transverse rows of short and acute 
brown teeth, the last row on each segment being the most regular; 
lateral edge of each tergum with an indentation which presents three 
subtriangular glistening spots, so arranged as to resemble a clover leaf, 
thorax with four pale longitudinal lines and near the anterior edge w ith 
two curved bristles, each of which is mounted on a minute mammilla. 
Imago. Female, Length 4-4-, 5 mm., length of wings 3,5 mm. BlacL, 
the whole body' covered with a glaucous bloom ; antennae black, clothed 
with appressed black hairs; lf-jointed, basal joint broad and very 
short, enclosing the base of the short but narrower second joint, tlnr 
joint the longest in the appendage; the succeeding joints very gra. u 
ally diminishing in length to the end, which is formed by a small sp er ica 
joint; palpi pale, tipped with black; face and eyes deep black roi 
crowned with a number of long black hairs, the cur\ed tips of wine 
bent forward ; upper surface of thorax nearly bare, a few dark hairs 
the pleurae; a pearly iridescence to the bloom of the tho.au 
scutellum, the latter with a few long pale hairs; wings large, io ml 
very broad, subfuliginous, in oblique light coirugated and l 
quite thickly covered with black hairs, which form a fringe aiou 
apical and posterior margins, the hairs ot the fringe beinglonges 
anal angle; four apparently distinctly' separated longitu mu. ’ 
first vein entering the costal margin about one third the en k 
wing from its base; second vein very straight, reaching to t p^ 
wing; third vein slightly, fourth more strongly bent, ee 
appearing dark because thickly covered with black liair i vescs ’ . 
with a few long silvery white hairs; ovipositor long, 310 ’ 
shaped, included between two orange yellow rods; °^ te " of tbe 
it protrudes beyond its sheath for a distance equa 
latter. 
Male, Length 2,75—3 mm. length of wings, 3 mm. D,ffe ' S , tr °™ rter 
female in the following points: Body smaller, abdomen^ ^ lpnE , th 
and more attenuated; antennal joints not muni 
towards the tip; thorax sparsely and venter thickly 
length 
,-ered with long , 
