No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 263 



Thorax: pronotum with a low setose prominence at middle. 



Abdomen : dorsum with a faint brown stripe on either side, 

 without dorsal spines but with elevations or prominences each 

 armed with a group of heavy setae ; lateral spines of segments 8 

 and 9 straight, that of 9 hardly as long as segment 10 ; lateral 

 terminal appendages about three-fourths as long as the superior, 

 which in turn is about four-fifths as long as the inferiors. 



Measurements : length of metathoracic wing-cases, 5 mm. ; 

 width of head, 4 mm. ; length of median lobe, 3 mm. ; width 3 mm. 



Described from a reared exuviae obtained from Dr. Calvert, 

 labeled "Micrathyria berenice Viereck, presumably from Cape May 

 region. New Jersey," 



Adult, male. — Color black and yellow. 



Head : black with yellow spots on the lateral lobes of the labium, 

 one on each side of the clypeus extending dorsad slightly onto the 

 front, and two small spots (sometimes united) on each side just 

 behind the compound eyes. Vertex and remainder of the front 

 metallic blue, the vertex evenly rounded at apex. 



Thorax: black, sometimes with yellow spots above the middle 

 and hind coxae and on the metepimera ; legs black, the procoxae 

 considerably flattened, the mesal margins forming a sort of ridge 

 provided with setae ; wings as in PI. xiii, Fig. 3, the brown spot 

 over the nodus usually lacking in this sex. 



Abdomen : black with yellow dashes on the sides of terga 3 or 

 4-7 ; black appendages of the second segment composed of long 

 auricles, the hamules with a spine-like inner lobe and a flat, 

 obliquely truncate outer one. 



Female. — Color yellow and black. 



Head : labium yellow with a black mesal line ; labrum yellow, 

 its ventral border black ; clypeus yellow ; front yellow with a 

 transverse black line above the suture, upturned at either end, and 

 connecting on meson with a somewhat triangular black area 

 extending ventrad from the ocelli ; vertex black, with a large oval 

 yellow spot above ; occiput and postgenae black, with 3 yellow spots 

 on each side behind the caudal margins of the compound eyes ; 

 occiput with a pair of closely placed yellow spots on the meson. 



Thorax : prothorax black with the following yellow : caudal 

 lobe of notum except lateral angles, an inverted W-shaped mark 

 on median lobes, cephalic margin and two small dots on each side 

 just above the coxae. Meso- and metathorax yellow with about 

 seven oblique longitudinal black lines on either side of the dorsal 

 carina, which is also black ; these lines present a wavy appearance 

 and the first four are connected behind ; coxae and trochanter and 

 venter of the front femora pale, remainder of the legs black ; 

 wings clear yellow at base and with a brown area over the nodus 

 which is extended in some individuals to occupy the greater part 

 of the wing. 



