340 ENTOMOLOGICAL NEWS [Oct., '09 



III or IV, the usual terminal one of V and the terminal one with group 

 of 6 crowded sensoria present on VI. Eyes red. Ocular tubercles 

 prominent. Beak 0.43 mm., extending to 3rd coxae. Thorax and 

 prothorax light green. Legs with femora light proximally and dark 

 and glistening distally; tibiae dark at proximal and distal ends with 

 light space between ; tarsi black. Abdomen light green with dark ring 

 at base of cornicle. Cornicle black, shaped and imbricated about as in 

 the winged viviparous form. Cornicles 0.32 mm. Cauda light yellow- 

 ish brown, ensiform, upcurved, 0.24 mm. Total length of body, exclu- 

 sive of antennae 2 mm. ; width .99 mm. 



Apterous oviparous female. Head light brown. Antennae black ex- 

 cept basal III. Antennae longer than body, 2.62 mm. with segments 

 measuring I, 0.15 mm.; II, 0.08 mm.; Ill, 0.6 mm.; IV, 0.48 mm.; V, 

 0.42 mm.; VI (base), 0.13 mm. Spur 0.76 mm. No sensoria except 

 the terminal one of V and the terminal one of VI accompanied by 

 crowded group of 6 marginal sensoria. Ocular tubercles prominent. 

 Beak 0.44 mm., extending just caudad of 3rd coxa. Thorax light 

 green. Legs colored as in winged viviparous form. Hind tibiae thickly 

 set with sensoria. Abdomen light green with dark patch around cor- 

 nicle. Cornicles dark brown, shaped and imbricated about as in the 

 viviparous forms. Cauda light yellowish, ensiform, length 0.2 mm. 

 Total length of body, exclusive of antennae, 2.25 mm. Width i.oi mm. 



Winged male. Head light yellowish brown. Antennae black, longer 

 than body, length 2.65 mm. with segments measuring I, 0.12 mm.; II, 

 0.08 mm.; Ill, 0.56 mm.; IV, 0.51 mm.; V, 0.41 mm.; VI (base), 0.12 

 mm. ; spur 0.85 mm. Sensoria thickly set in III, IV and V. Terminal 

 sensoria of V and group of VI similar to those of the other 3 forms. 

 Ocular tubercles prominent. Beak 0.37 mm. reaching nearly to 3rd 

 coxa. Thorax glistening brown. Prothorax light green. Wings with 

 venation as in the alate viviparous form. Wings expand 4.95 mm. Legs 

 colored as in alate viviparous form. Abdomen light green. Cornicles 

 dark and strongly imbricated as in the other forms. Cornicles more 

 uniformly cylindrical than in the other forms. Cauda lighter than 

 abdomen, ensiform, about the length of tarsus, 0.12 mm. Total length 

 of body, 1.125 mm.; width 0.56 mm. 



The entire life cycle of the colonies observed in Maine is 

 passed upon the Canadian or showy tick-trefoil, Desmodiwm 

 canadense DC. The species reproduces upon the trefoil dur- 

 ing the summer, and during July the colonies of apterous and 

 alate viviparous forms thickly crowd the tips of the branches 

 and the ventral surface of the leaves which become badly 

 twisted and curled. From the middle of August to the middle 



