HOW TO KNOW THE IMMATURE INSECTS 



2a. Compound eyes large, more or less contiguous; ocelli present; 

 styli present on thoracic coxae, also on abdominal segments 2-9. 

 Fig. 113 Family MACHILIDAE 



Bristletails, silverfish, and slickers are the comjnon 

 names. The family contains about 150 described 

 species. They inhabit grassy and woody areas. Some 

 are tenants in caves and some inhabit the nests of 

 termites. At least six instars have been reported. In 

 the first two instars scales and styli are absent. 



Pig. 113. Machi-' 

 lis morithno 



Leach. 



2b. Compound eyes small, widely separated; ocelli absent; styli ab- 

 sent on thoracic coxae, but present on abdominal segments 7-9 or 

 8-9. Fig. 114 FamUy LEPISMIDAE 



About 200 species are known. They are com- 

 monly called the bristletails, fish-moths or slick- 

 ers. They are found in dry hot places, among 

 leaves, under stones, debris, caves, buildings and 

 the nests of ants and termites. They feed upon 

 dry vegetation or plant products. They are also 

 fond of paste, glue and rayon cloth. The silver- 

 fish, Lepisma saccharina L. and the fire brat, 

 Thermobia domestica (Packard) are common in 



buildings. 

 Fig. 1 14. Thermobia 

 domestica (Packard). 



2a,, Styli absent on 1st abdominal segment. 

 Fig. 115 Family CAMPODEIDAE 



About 75 species have been described. 

 Most species are from the Palaearctic, 

 Neorctic and Neotropical regions with 

 very few known in the Oriental regions. 

 They are blind and occur in damp places. 



56 



Pig. 115. Campodeo frogil- 

 is Meinert. 



