THE CRANE-FLIES OF NEW YORK PART II 977 



The following keys separate the genera of the subfamily Tipulinae: 



Larvae ^ ; 



1. Spiracular disk surrounded by five lobes; living in moss Dolichopeza Curt. (p. 981) 



Spiracular disk surrounded by four or six lobes, or with lobes indistinct ..--. 2 



2. Spiracular disk with lobes indistinct; living in nearly solid or semi-decayed wood. 



Tanyptera Latr. (p, 988) 

 Spiracular disk with lobes distinct 3 



3. Spiracular disk with four slender, hornlike lobes Tipula (selene Meig.) (p. 1016) 



Spiracular disk with six lobes 4 



4. Anal gills pinnately branched. . . .Longurio Loew (p. 990) 



Aeshnasorna Johns, (p. 993) 

 Anal gills not pinnately branched 5 



5. Antepenultimate segment of abdomen with a strong lateral tubercle. 



Oropeza Needm. (p. 982) 

 Antepenultimate segment of abdomen without such a tubercle 6 



6. Dorsum of head behind antenna with a slender, flexible spine; living in wood. 



Ctenophora (apicata O. S.) (p. 986) 

 Dorsum of head without such a spine 7 



7. Lobes surrounding spiracular disk elongate, digitiform, fringed with long hairs. 



Prionocera Loew (p. 995) 

 Lobes surrounding spiracular disk less elongate 8 



8. Size large (over 50 mm.); spiracular disk with the six moderately long lobes fringed with 



long hairs; mandible small, with a dorsal and a ventral tooth; found in western North 



America Holorusia Loew (p. 993) 



Size smaller; if large (T. abdominalis) , the lobes surrounding disk bifid; mandible with 



two or three ventral teeth Tipula Linn. (p. 998) 



Nephrotoma Meig. (p. 1016) 

 Pupae 



1. Pronotal breathing horns very long, slender, the longest one nearly if not quite half length 



of body 2 



Pronotal breathing horns short, cylindrical or flattened, subequal in size 3 



2. Length 40 mm.; longest breathing horn 18 mm.; maxillary palpi not recurved at tips; 



venation with petiole of cell Mi very short Longurio Loew (p. 990) 



Length 20 mm.; longest breathing horn 9 to 10 mm.; maxillary palpi recurved at tips; 

 venation with petiole of cell MI longer Prionocera Loew (p. 995) 



3. Pronotal breathing horns short, compressed, deeply bicrenulated; living in wood. 



Tanyptera Latr. (p. 998) 

 Pronotal breathing horns cylindrical 4 



4. Maxillary palpi not recurved at tips 5 



Maxillary palpi recurved at tips " 



5. Pronotal breathing horns with apices deeply split; mesonotum with two tubercles; 



abdominal segments with fourteen to thirty-four spines; found in Western States; 



living in mud Holorusia Loew (p. 993) 



Pronotal breathing horns short, slender, apices not split; mesonotum with eight tubercles; 

 abdominal segments with four powerful spines near posterior margin; found in Southern 

 States; living in wood Brachypremna O. S. (p. 984) 



6. Mesonotum with two spines; ventral abdominal spines six to eight; fore and middle tarsi 



subequal, shorter than hind tarsi; living in wood Ctenophora Meig. (p. 98o) 



Characters not as above : 



7. Mesonotum with a large, roughly triangular, reticulated area on either side of median 



line; dorsum of cauda with four lobes Oropeza Needm. (p. 982) 



Mesonotum unarmed or with four or six lobes; dorsum of cauda with six, or rarely four 



I b es Tipula Linn. (p. 998) 



Nephrotoma Meig. (p. 1016) 



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