18 
Psyche 
[March 
Case not as above, and differently closed 21 
21. Case of stones with ballast rocks at the side, straight, 
never curved : 
Sericostomatidse, subfamily Goerinse in part 
Not as above ; case with a definite curvature : 
some Odontoceridse 
In families Hydropsychidse (with subfamilies Hydro- 
psychinse, Arctopsychinse and Macronematinse) , Psycho- 
myiidse (with subfamilies Psychomyiinse, Polycentropodinse 
and Ecnominse) and Philopotamidse (with subfamilies 
Philopotaminse and Chimarrhinse) , the 5th segment of the 
maxillary palpi is secondarily segmented in the pupa and 
adult. In Leptoceridse it is long and slender and often 
curved but never segmented. In males of Phryganeidse, the 
fifth segment is lacking, so that the maxillary palpi are 
4-segmented; in males of Limnephilidse (with subfamilies 
Apataniinse and Limnephilinse) and Sericostomatidse (with 
subfamilies Brachycentrinse, Helicopsychinse, Lepidosto- 
matinse, Goerinse and Sericostomatinse) the 4th and 5th seg- 
ments are lacking so that the palpi are 3-segmented. The 
females of these families and both sexes of families Hydrop- 
tilidse, Rhyacophilidse (with subfamilies Rhyacophilinse, 
Hydrobiosinse, Glossosomatinse) , Berseidse, Molannidse and 
Odontoceridae (with subfamilies Odontocerinse and Cala- 
moceratinse) have five segments to the maxillary palpi. In 
all Limnephilidse, Philopotamidse, Phryganeidse, Rhyaco- 
philidse, two genera of Sericostomatidse (Thremma and Neo- 
thremma of Goerinse), and in six genera of Hydroptilidse 
(Agraylea, Allotrichia, Ithytrichia, Neotrichia, Oxyethira, 
and Polytrichia) there are ocelli, but elsewhere they are 
lacking. 
Spur Formulae of North American Trichoptera 
Formula Family Genera Concerned 
0-2-2 
Leptoceridse 
Leptocella, Leptocerus, Setodina, 
Ymymia 
0-2-3 
Hydroptilidse 
Neotrichia 
0-2-4 
Hydroptilidse 
Hydroptila 
0-3-4 
Hydroptilidse 
Agraylea, Allotrichia, Ithytrichia, Ortho- 
trichia and Polytrichia 
