856 



Charles Paul Alexander 



as in many species of Limnophila and in the eriopterine series allied to 

 Gonomyia (Gonomyia, Ilhabdomastix, and other genera), these pits lie 

 one on either side of the median line of the prescutum, at the extreme 

 cephalic margin; in other groups, as in the eriopterine series allied to 

 Erioptera (Erioptera, sens, str., Empeda, and other genera), they are 

 found on the dorsum of the prescutum, about midlength of the segment. 

 These pits are the double, or paired, dots of Osten Sacken. 



The pseudosutural foveae (fig. 126, b) are prominent depressions on the 

 sides of the prescutum, in front, lying just above the anterior spiracles. 



Anferior" 



Spiraciti 



l^/'nq roof Mesepimeron 

 Transi/erse \ 



suture \5cutellum,' 



^- 3cufum\ \ /Postnofum M'onofum 



■ tfalfer yt'lefanofi^m 



Tuberculoid 

 Abdominal ^ 



ierqife I 



. /ibdominaf 

 stern iteZ 



coxa- 



Fore coxa 



tliddle coxa 

 Hesosivnurr) 

 Mesep/sternum 



A B 



Fig. 126. thorax of tipula 

 A, Lateral aspect; B, dorsal aspect. Adapted from Snodgrass 



Pseudosulural foi^eo 

 -Mesonoial prescutum 



Jransyerse suture 

 -5cutum 



Scutellurrt 

 •-PostnofuiiTt 



usually in the area before the ends of the short lateral stripes and at the 

 sides of the longer median stripe. These structures have been called 

 the humeral pits. 



The scutum is the second subdivision of the mesonotum. It lies just 

 behind the V-shaped suture and is usually divided into two lateral lobes 

 by a shallow median depression. 



The scutellum is the third subdivision of the mesonotum. It is a small 

 transverse segment, lying just behind the lobes of the scutum and before 

 the postnotum. 



The postnotum is the fourth and last subdivision of the mesonotum. 

 It is a large and prominent sclerite situated behind the scutellum, appearing 



