SYNOPSIS OF SPECIES DESCRIBED. 37 
acute angle, triangular, sharp, the anterior half length of the posterior; lateral appendages only 
one fourth shorter than middle one. 
10. 4. Grandis Linn. (Raised.) 
Nymph, full-grown, male and female. Europe. 
Hind angles of head more oblique ; mask similar to A. rufescens ; processes longer, more 
separated, of equal length, sharp, bent a little outwards, the anterior rather slender; lateral 
appendages about half the length of the middle one. 
il. ZB. Cyanea Muell. (Raised.) 
Nymphe, full-grown, male and female. Europe. 
Hind angles of head oblique; basal half of mask, narrower ; processes short, about of 
equal length, enclosing a right angle; posterior larger, rounded in sides; lateral appendages 
half length of middle one. 
12. 2. Juncea Linn. (Raised.) 
Nymphe, full-grown, male and female. Europe. 
Similar to Al. cyanea; anterior process half length of posterior, much smaller. 
13. #4. Viridis Eversm. (Raised.) 
Nymphe, full-grown, male and female. Europe. 
Similar to Al. rufescens; hind angles of head more oblique ; processes of equal length, 
sharp tips a little bent outwards, enclosing right angle; lateral appendages half length of 
middle one. 
14. 2. Mixta Latr. (Raised.) 
Nymphe, full-grown, male and female. Europe. 
Similar to AZ. cyanea; hind angles of head rounded; mask gradually enlarged at apical 
third ; processes blunt, stout, equal in length, anterior narrower; not much separated; lateral 
appendages about half length of middle one. 
15. #4. Affinis Vander Lind. (Raised. ) 
Nympha, full-grown, male. Europe. 
Similar to Al. mixta, more slender; processes blunt, very slightly separated, of equal 
length and size; lateral appendages shorter. 
B. Lateral spines on fifth to ninth segments ; no teeth on front border of mask ; lateral 
appendages shorter than the inferiors ; middle one notched at tip. 
16. #4. Eremitica Scudder. (Supposition.) 
Nymphe, full-grown, male and female. Arctic America and New Hampshire. 
Similar to AB. rufescens; hind angles of head oblique ; processes long, equal, sharp, tips 
bent a little outwards, enclosing less than right angle; lateral appendages two thirds length 
of middle one; female valves not quite reaching tip of segment. 
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