No. 34.] HEMIPTERA OF CONNECTICUT: APHIDIDAE. 325 



2. Secondary sensoria nearly uniform in shape. Joint vi longer than v 3 

 Secondary sensoria irregular in form, crowded. Joint vi distinctly 



shorter than v gravicornis 



(Fundatrigenia) 



3. Antennal joint v subequal to 'one-half the length of front tarsi. 



Sensoria narrowly oval, distinctly raised above surface of joint 



populi-monilis 

 (Fundatrigenia) 

 Antennal joint v subequal to length of front tarsi. Sensoria linear 

 or broadly linear, but slightly raised above surface of joint .... 



populi-conduplifolius 

 (Sexuparae) 



T. gravicornis (Patch). Pemphigus gravicornis Patch. 



Me. Agr. Expt. Sta., Bull. 213, 75, 1913. 



Host plant Populus balsamifera. The affected leaves are folded 

 lengthwise along the midrib and their margins are applied together 

 at their ventral surfaces, — the whole leaf swollen into a pouch filled 

 with aphids. The characteristic antenna of the alate female serves 

 to distinguish this from all other known species. For description 

 and figures see Patch (1913). 

 T. populi-conduplifolius Cowen. 



While the stem mothers of this species and T. patchii Gillette 

 appear to have different habits positive evidence of the fact seems 

 to be lacking. A comparison of the alate forms of these species 

 does not reveal any constant differences which would warrant their 

 separation, therefore, the writer considers patchii a synonym of 

 populi-conduplifolius. 



On balsam poplar, Mystic, 20 June, 191 1 (A. L. Beebe). 



Mordwilkoja Del Guercio. 



Stem mother with four- jointed antennae. Wax pore plates not 

 developed on head, present on thorax and abdomen. Prothorax 

 with four plates in transverse row. Young of stem mother all 

 acquire wings. 



Alate viviparous females with six-jointed antennae. Spur of 

 sixth segment longer than joint and bearing several small oval sen- 

 soria. Secondary sensoria broadly linear to narrowly oval, trans- 

 verse. Mesothorax with or without wax pore plates. Fore wing 

 with M simple. Hind wing with media and cubitus present. 

 Cornicles present, weakly developed. Rudimentary gonopophyses, 

 three. Sexuals unknown. 



M. vagabundus (Walsh). Byrsocrypta vagabunda Walsh. 

 (PI. xi, 1.) 



Proc. Ent. Soc. Phila., i, 306, 1862. 



The only species of this genus produces large galls, composed of 

 an entire leaf, on Populus occidentalis which is the winter host. 

 Summer host not known. This species can be separated from any 

 other Pemphigid by the long spur on the sixth segment of the 

 antennae. 



