Herbert Weir Smyth, A Greek Grammar for Colleges

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[*] 539. These futures usually occur when ς is preceded by α^ or ε and these vowels are not preceded by a syllable long by nature or position. Here ς is dropped and -άω and -έω are contracted to -ῶ. When ι precedes ς, the ending is ι-（ς）έω which contracts to -ιῶ.

a. καλέω call, τελέω finish drop the ς of καλέσω καλέσομαι, τελέσω τελέσομαι and the resulting Attic forms are καλῶ καλοῦμαι, τελῶ (τελοῦμαι poetic).

b. ἐλαύνω (ἐλα-) drive has Hom. ἐλάω, Attic ἐλῶ.—καθέζομαι (καθεδ-) sit has Attic καθεδοῦμαι.—μάχομαι (μαχ-ε-) fight has Hom. μαχέσομαι (and μαχήσομαι), Attic μαχοῦμαι.—ὄλλυ_μι (ὀλ-ε-) destroy has Hom. ὀλέσω, Attic ὀλῶ.