Osten Sacken.] 144 [October 6, 



S. philadelphicus] he evidently had soiled specimens. The thoracic 

 dorsum here is more bronze color, less green than in S. torvus. 



Among some Syrplii from the European collection of Dr. Zeller in 

 Stettin, now belonging to Mr. E. Burgess in Boston, there is a speci- 

 men labelled " Silesia," which seems to agree in every respect with 

 S. Lesueurii. 



4. S. abbreviates. 



(Zetterstedt) Schiner, Fauna Austr., I, p. 311. 



Male. Face yellow; cheeks black, which color coalesces with the 

 brown oral border, and is connected, under the oral opening, with 

 the black on the opposite side; in some specimens the facial tubercle 

 is also brownish ; third antennal joint brown sh, more or less reddish 

 on the underside, sometimes altogether reddish; front yellow; no 

 brown spots above the antennas; vertex blackish bronze-color. Eyes 

 bare. Thoracic dorsum rather bright brassy green. Yellow spots on 

 second abdominal segment rather large, obliquely triangular, touch- 

 ing the margin with the apex only; the interval between them mod- 

 erately broad, equal to about one-third or one-fourth of the breadth 

 of the spot; yellow bands on segments three and four rather broad, 

 much broader than the black band between them; the posterior mar- 

 gin in both is sinuate in the middle, more markedly in the band of the 

 third, than on that of the following segment; the bands do nol reach 

 the abdominal margin, and are cut off* obliquely on the sides; the 

 distance of their anterior corner from the margin is very small, how- 

 ever; fourth segment with a narrow yellow border posteriorly; fifth 

 segment yellow, with a small transverse black spot in the middle, 

 near the base. Legs yellow, but base of all the femora black] on the 

 hind femora the black occupies one-third or one-half of the femur. 



Fenmle. Resembles the male, but with the following differences: 

 lower part of the front, above the antennae, yellow * r upper part and 

 vertex, brownish green; oral border less infuscated, the infuscation 

 being usually distinct in the middle of the excision only; the yellow 

 spots on the second abdominal segment are larger, the interval be- 

 tween them narrower, often linear, sometimes obsolete; the bands on 

 the third and fourth segments are comparatively narrower than in 

 the male, and but little broader than the interval between them; 

 their hind margins are gently concave-sinuate in the middle, and 

 convex-sinuate each side; both bands distinctly reach the abdominal 

 margin] fifth segment yellow, with a triangular black spot in the 

 middle \ coxa? black, but femora altogether yellow; (the four anterior 



