HOW TO KNOW THE IMMATURE INSECTS 



30b. Several ocelli placed together on each side of head. 



Fig. 205 Family RHIPIPHORIDAE 



The larvae of this family are of great 

 interest on account of their parasitic 

 habits. Metaecus paradoxus is a para- 

 site in nests of Vespa, but the eggs are 

 laid in old wood. The larva becomes 

 an endoparasite and then changes to 

 ectoparasite. Pupation takes place in 

 the cell of the host. 



ouaus 



Fig. 205. Phlpiphorus solidaginis 



Pierce. 



31a. Mandible bearing an accessory ventral 

 condyle; with either a free galea well sep- 

 arated from a distinct lacinia or with cri- 

 briform spiracles, or with both characters. 

 Fig. 306 32 



-^ C^ie/t,f:o/ifM S/>''!*<l.e 



31b. Characters not so combined. 



Fig. 206. a, A right 

 mandible; b, A max- 

 illa; c, A cribriform 

 spiracle. 



40 



32a. Median epicranial suture present; 10th abdominal segment well 

 developed, usually about as large or larger than the well devel- 

 oped 9th abdominal segment, sometimes fused with it dorsally, 

 when shorter than 9th abdominal segment, then provided with a 

 pair of large anal pads 33 



32b. Median epicranial suture absent; 10th abdominal segment much 

 smaller than the well developed 9th abdominal segment and al- 

 ways without anal pads, or both 9th and 10th abdominal segments 

 vestigial 37 



33a. Stridulating organ present on mesothor- 

 acic leg; abdominal terga not plicate. 

 Fig. 207 34 



Fig. 207. A mesothorac- 

 ic leg. 



86 



