3 ^ 
Genus I.— SIPHONOPHORA * Koch. 
Siphon-aphis. Rohrenlaus. 
Rostrum moderately long. Last joint almost as 
stout as tlie penultimate. 
Antennse very long — at least as long as the whole 
body, seated on distinct frontal tubercles. The two 
basal joints stout and thick. The third, fourth, and 
fifth joints long. The third joint the longest. The 
seventh joint setaceous, and much longer than the 
sixth. 
Front grooved. The frontal tubercles approximate. 
Cornicles very long, cylindrical, straight, or more 
rarely curved, 
Cauda markedly long, generally recurved and ensi- 
form. 
Legs very long and slender. 
Wings carried vertically when folded. Fore wings 
with four oblique veins, the cubital vein twice forked. 
The hind wings with two oblique veins. 
As far as is at present known the males of this 
genus are winged, and the oviparous females are 
apterous. 
The males usually have smaller abdomens, larger 
wings, and longer antennse than the winged females. 
/ SiPHONOPHORA ROSiE, BSaumer. Plates I, II, and IV, 
figs. 1, 2, 3. 
Aphis Tosce^ Reaumur, Linn,, Fabr., De Geer, Schrank, 
Burm., Kalt., and others. 
Siphonophora rosce, Koch. 
^ From aiipuiv a tube, (popso) I bear. 
N.B. — The term Siphonophora has been unfortunately employed to 
denote an order of the oceanic Hydrozoa. Still, between animals so 
different in structure it is not likely that confusion will arise in 
nomenclature^ 
