20 



THE CALIFORNIA SPECIES OF MEALY BUGS 



Mouthparts. These seem to present no characters of taxonomic 

 value. 



Dorsal Ostioles. Upon the dorsum of all the Pseudococcine forms 

 examined by me there are to be found at least one pair of curious pits 

 with raised, lip-like margins, the "eye-like glands" or "cicatrices" of 

 various authors, the "fossette ostioloformi labiate" or "foveole labiate" 

 of Berlese (1, p. 82, figs. 8, 10). It is probable that two pairs of these 

 are always present, one pair being found just within and slightly behind 

 the eyes, the other being on the third segment from the posterior end of 

 the abdomen or between the second and third segments. The position of 



Fig. 13. Pseudococcus longispinus (Targ.) ; outline of body to show position of 



dorsal ostioles. 



these organs is shown in figure 13. To these I apply the name "dorsal 

 ostioles," for they appear to correspond in function to the lateral ostioles 

 of the Heteroptera. Berlese seems to have regarded these structures as 

 points of attachment for muscles, but this interpretation is probably 

 wrong. If an active mealy bug be disturbed it may aften be noticed 

 that one or more globules of liquid appear upon the dorsum. The posi- 



