H. F. WILSON 99 



III. NEW SPECIES OF APHIDS 



Amphorophora subterrans new species (Plate IX, figs. 1 to 4.) 



Collected on roots of Dactylis glomerata Linn, at Corvallis, 

 Oregon, April 6, 1912. Very abundant 6 to 8 inches below the 

 surface of the ground in loose soil. Apterous, alate and pupae 

 forms found. 



Apterous iriviparmis female: General color dark green with a bro^sTiish tinge- 

 Antennae black, eyes dark red. Legs j^ellow except at the tips of femora and 

 tibiae and tarsi, which parts are black. Nectaries and cauda black. Body 

 sparsely set with short haii-s. Antennae reaching beyond the tip of the cauda, 

 third segment with two circular sensoria near the Ijase. Nectaries reaching 

 to the base of the cauda and swollen in the middle. Cauda tapering and 

 blunt at the tip. 



Measurements: Length of body, 1.95 mm.; width, 1 mm. Length of 

 antennal segments; III, 0.56 mm.; IV, 0.42 mm.; V, 0.3 mm.; VI, 0.135 mm.; 

 spur, 0.67 mm. Length of nectaries, 0.46 mm.; length of cauda, 0.154 mm. 



Alate mviparous female: General color head and thorax dark green or black; 

 abdomen moss gi-een with a dorsal dark green spot which is slightly narrower 

 behind. Antennae black; legs dusky or black except femora, which have the 

 basal part dusky yellow. Nectaries black; cauda black at the tip. Antennae 

 longer than the body and on distinct antennal tubercles, third segment with 

 8 to 11 large circular sensoria. In some species an occasional small sensorium 

 may be found adjacent to one of the larger ones. Body, antennae and femora 

 sparsely set with short hau-s. A distinguishing characteristic of this species 

 is found in the ocular tubercles which themselves bear two or three smaller 

 tubercles. Wing venation normal. Nectaries as in the apterous forms and 

 semi-annulated just back of the tip which is strongly flanged. Cauda ensi- 

 form and tapering to a blunt tip. 



Measurements: Length of body, 1.9 mm.; width, 0.9 mm. Length of 

 antennal segments: III, 0.53 mm.; IV, 0.42 mm.; V, 0.38 mm.; VI, 0.176 mm.; 

 spur, 0.73 mm. Length of nectaries, 0.4 mm.; length of cauda, 0.16 mm.; 

 length of wing, 3 mm.; width at widest part, 1.22 mm. 



Macrosiphum mentzeliae new species (Plate IX, figs. 5 to 9.) 



Collected on Mentzelia at Monclova, Mexico, Nov. 23, 1909. 

 This aphid was sent to me by Mr. F. C. Bishopp of the U. S. 

 Bureau of Entomology. The specimens obtained are in alcohol 

 but from the general light color they must have been of a pale 

 green color. The color markings are not necessary for the easy 

 determination of this species, however, as the entire body, legs 

 and antennae bear short curved, capitate hairs. 



Apterous viviparous female: Antennae longer than the luxly, dark at the 

 tips and rather slender. Third segment with two small sensoria. Abdomen 



TRANS. AM. ENT. SOC, XLI. 



